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Forum: Non-Pentax Cameras: Canon, Nikon, etc. 6 Days Ago  
Samsung NX mini, a Top Infra-Red ILC for $125€
Posted By geo444
Replies: 2
Views: 215
.
And just at the moment they reached the Top of the Best possible Image Quality !
That was an incredible surprise for everyone...

Sometimes... I think that Pentax, after their K-5's Big Success...
should have resumed its sensor supplies from Samsung
when their NX1 and NX500 reached DxoMark's top !

Instead of being forced by Nikon to settle for old Sony sensors...
... the Pentax K-1's sensor is the one of the D800E !
Imagine a K-1 w/ D850 sensor + Pixel-Shift...

Don't you think so ?

;)
Forum: Non-Pentax Cameras: Canon, Nikon, etc. 6 Days Ago  
Samsung NX mini, a Top Infra-Red ILC for $125€
Posted By geo444
Replies: 2
Views: 215
.
Here are 2 ways to get a used Samsung NX mini :
- NX-mini Kit w/ 9-27 ED OIS zoom lens + Ext. Flash : ~$150€ = the price of ~3 R72 Filters
- Body Only or with the 9mm ED Pancake lens : ~$100€ = the price of ~2 R72 Filters

The Kit gathers almost Everything interesting from Samsung for ~$150€...
the Ma4NxM adapter and the 17mm f/1.8 are Very Rare...

For the price of 2 / 3 R72, you'll be able to Avoid that R72 Filter, thus the Tripod + High ISO setting :
http://mecastronics.free.fr/stora/NXmini9mmBAREimx183.jpg
Exif : NX-mini, 9mm f/3.5 @ f/8, 1/558 sec. ISO 100

Yes, the Q, Q10's sensors are 44.4% More Sensitive :
Camera Sensor Comparison Tools

For beginners, the Samsung NX mini have a lot of advantages :
Samsung-NX-mini-TOP-Infra-Red-ILC

+ NX-mini are easy to find at $100€ or less

+ NX-mini's IR-cut removal is 100% Fully Reversible

+ NX-mini's AF is still 100% Reliable after its IR-cut removal
>> that opens to you the door to Fantastic Hand-Held Terrestrial IR PhotoGraphy -vs-
with the IR-Cut in place + a R72 Filter you're restricted to High-ISO-Tripod :
landscape-IR-photography - Google Search
Best 25+ Infrared Photography ideas on Pinterest | Pink trees, Beautiful nature spring

+ NX-mini's Wider Sensor mounted on a 800 mm will cover Veil Nebula's 2 parts :
Photos tagged with "nx-mini": Galleries: Digital Photography Review

+ NX-mini's Bigger Pixels are Far Less Demanding from Atmosphere Stability :
M1 Crab Pentax Q10: geo444: Galleries: Digital Photography Review

+ NX-mini's Bigger Pixels are Far Less Demanding on Eq-Mount-Precision :
Pentax Q, Q10, most Sensitive sensor ILC

+ NX-mini can hold 240 seconds Bulb Exposures !

+ NX-mini's L.E.N.R. is Fully Cancelable !

+ NX-mini's Huge Battery will last a Winter-Night long !

+ NX-mini's Wired Remote Controlers are easy to find at $25€ or less
... SR2NX02 compatibles

+ I'll add one page : How to add a T2-Mount-Thread M-42x0.75 for $25€ on your NX-mini
... this is crucial because Sam's MA4NXM Adapters are out of stock...

Here is the last Astrophotography I posted from that little Costless Camera.
it's not as sharp as I hoped : the 2nd Night, I got Huge Turbulence
Fine Colors, No Dark-frames, nor Bias-Maps subtracted :
.

Right Click + View Image to enlarge Full-Size
.
The result of the 1st Night is 5 pictures before in my gallery :
Much Noisy, 13 subs instead of 24, but Sharp !

You'll get better pics with yours...

:cool:
Forum: Pentax Q 03-11-2019, 05:19 PM  
Pentax Q 01 prime focus issue
Posted By geo444
Replies: 7
Views: 536
Hi All ! ;)

I don't know if you can find it near your Cities : KF-F2 Electr(on)ic Contact Cleaner
Amazon keeps this indispensable Product in stock in Europe :
Aérosol 200 ml KF F2 Spécial contacts (1002): Amazon.fr: High-tech
Aérosol 500 ml KF F2 Spécial contacts (1001): Amazon.fr: High-tech

its very, Very Effective for Bad Contacts :
Declencheur EOS 30D/40D/50D Nettoyage P.1

it's Non-agressive for Plastic, Rubber, etc...
it's very very Penetrating...
Just Avoid the internals parts of Optics, where it could leave stains when drying...
Declencheur EOS 30D/40D/50D Nettoyage P.2

An indispensable tool with all the electr(on)ic devices we use...
https://www.chassimages.com/forum/index.php/topic,145962.0.html

;)
Forum: Pentax Q 03-06-2019, 12:44 PM  
Pentax Q for astrophotography beginner?
Posted By geo444
Replies: 55
Views: 7,413
.
Hi all Pentax Q's AstroPhotographers ! ;)

Two Pages with a File to Download + that File have been updated.
Sony specs pages : imx078cqk.zip now contains the 2 *Digit Values to calculate the
imx078cqk Exmor CMos Sensor's Sensitivity :
Camera Sensor Comparison Tools
Pentax Q, Q10-IRcut, most Sensitive Sensor ILC
.

.
As your Title ends with the words " astrophotography beginner ", I had to be honest, and ....
to report to you, every future astrophotography beginner, that the Q, Q10 are way more complicated to get
instantly nice results than the NX-mini for all the reasons I listed above...
.
Then, I don't think that buying a NX-mini Kit is really an investment = 2 ways to buy a used one :
- NX-mini Kit w/ 9-27 ED OIS zoom lens + Ext. Flash : ~$150€ = the price of ~3 R72 Filters
- Body Only or with the 9mm ED Pancake lens : ~$100€ = the price of ~2 R72 Filters

The Kit gathers almost Everything interesting from Samsung for ~$150€...
the Ma4NxM adapter and the 17mm f/1.8 are Very Rare...

For the price of 2 / 3 R72, you'll be able to Avoid that R72 Filter, thus the Tripod + High ISO setting :
http://mecastronics.free.fr/stora/NXmini-9mm-BAREimx183.jpg
Exif : NX-mini, 9mm f/3.5 @ f/8, 1/558 sec. ISO 100
.
Else, yes the Q, Q10's sensors are ~44.4% More Sensitive : :D
Camera Sensor Comparison Tools
.

.
I copied your MP here, in the hope maybe to get more informations ?

My appartment has been flooded 4 times since 2015, so I can't remember where did I put that IRcut filter ? :hmm:
It's a very Thin ~Composite~ ( Not 100% shure ? ) Filter... the ribbon-cable is firmly glued on it...
Maybe you could try to peel-off the ribbon-cable out of the IRcut filter ??
There is No Room to operate, your Fingers are way bigger than these tiny parts...
So, I didn't even try to operate this way ??

Another way to resolve the unreachable infinite by the AF, would be to reduce the Flange distance...
If I remember correctly... there is a Thin Washer under the Q10 Baionette Mount ?
Is this the Mount-Spring ?... Or is it a Separate Washer ?
Could it be replaced by a thinner one ?

Hope you'll find a way to keep the AF working...
I understand it's The question of all the Lenses you already own.
Sorry... I was mainly interested by AstroPhotography with my 200/1000 SkyWatcher !
I own the Pentax-Q 5-15 zoom lens, so if I find some idea, I'll post it here...

;)
Forum: Pentax Q 02-19-2019, 05:10 AM  
Pentax Q for astrophotography beginner?
Posted By geo444
Replies: 55
Views: 7,413
.
Hi 2old4toys ! ;) Many Thanks for your encouraging kind words !


.
I think you'll have to make a Definitive / Irreversible Choice :
Remove its IR-cut filter... and your Q, Q10 is definitely Dedicated to Astrophoto !
Manual Focus is the usual way for AP...
Not an issue !


.
Before making a Definitive / Irreversible Choice by maiming your Q, Q10 :o
I suggest you and every Pentaxian interested in Astrophoto AND/OR in Landscape IR PhotoGraphy
Please... Read Carefully my page about the NX mini
Samsung-NX-mini-TOP-Infra-Red-ILC

+ NX-mini are easy to find at $100€ or less
+ NX-mini IR-cut removal is 100% Fully Reversible
+ NX-mini's AF is still 100% Reliable after its IR-cut removal
>> that opens to you the door to Fantastic Hand-Held Terrestrial IR PhotoGraphy -vs-
with the IR-Cut in place + a R72 Filter you're restricted to High-ISO-Tripod :
landscape-IR-photography - Google Search
Best 25+ Infrared Photography ideas on Pinterest | Pink trees, Beautiful nature spring
+ NX-mini's Wider Sensor mounted on a 800 mm will cover Veil Nebula's 2 parts :
Photos tagged with "nx-mini": Galleries: Digital Photography Review
+ NX-mini's Bigger Pixels are Far Less Demanding from Atmosphere Stability :
M1 Crab Pentax Q10: geo444: Galleries: Digital Photography Review
+ NX-mini's Bigger Pixels are Far Less Demanding on Eq-Mount-Precision :
Pentax Q, Q10, most Sensitive sensor ILC
+ NX-mini can hold 240 seconds Exposures !
+ NX-mini's LENR is Fully Cancelable !
+ NX-mini's Huge Battery will last a Winter-Night long !
+ NX-mini's Wired Remote Controls are easy to find at $25€ or less
+++ I'll write 1 page : How to add a T2-Mount-Thread M-42x0.75 for $25€ on your NX-mini
... this is crucial because Sam's MA4NXM Adapters are out of stock...

- But Yes, the Q, Q10's sensors are 44.4% More Sensitive !... :D

If I were You ?......

:asleep:
Forum: Pentax Q 02-18-2019, 04:20 AM  
Pentax Q for astrophotography beginner?
Posted By geo444
Replies: 55
Views: 7,413
.
Thanks DC ! Sorry, apologies for the delay...
All the Photos Posted on Chassimages have been lost... and I sold my Macro Bellows 4 years ago...
Took me a long time to make a Drawing, I hope everyone will find it clear ?

Here, things are Not Simple at all !
From Buldings Crashing down after some rain... to Yellow Jackets...
Crashed Buildings were Newer than where I live ! :eek:

I just meant it was as simple as for the NX-mini to Remove the IR-Filter on Q, Q10 !

/!\ The photo posted by 2old4toys is somewhat misleading :
- you have to Cut the Box at 1,1 mm from its Edges to Avoid Breaking the Filter,
your Sensor'll be full of Glass Crumbs !

My Howto / DiY page " Remove Q10 IR-cut Filter " not totally finished, but at least online :
Pentax Q, Q10, most Sensitive sensors ILC
You just need a Cutter + some time...
is my Drawing Clear ?

Compare the Sensitivity of Sensors per Area, 2 methods :
Camera Sensor Comparison Tools
Litho+Etch Precision increase Sensitivity

The only hope to go over the 30 sec. Stupid Limitation of the Q, Q10, Q7... :
Pentax-Q10-v1.03-FirmWare-Disassembly
Disassembling is only the very First Step...
... who knows a "C" Decompiler suitable for MIPS RISC Processors ?


.
You're right, it's Prime Focus : many other infos to find on my DPReview Galleries :
geo444: Galleries: Digital Photography Review : Digital Photography Review



Yes Gcisko, all my AstroPhotos taken in prime focus.
I'm Guiding with a ToUCam Philips mounted on the SkyWatcher finderscope
SoftWare is PHD from StarkLabs
If you are able to achieve a Reliable Station Setting, it's not necessary for 30 sec. subs ?

I never tried afocal, you should, just to get an idea on the results ?
Thanks Gcisko ! ;)
Forum: Pentax Q 10-22-2018, 04:18 AM  
Pentax Q for astrophotography beginner?
Posted By geo444
Replies: 55
Views: 7,413
Maybe the smallest among these New Sony Sensors :
Products Line up for Camera Image Sensor for Camera | Sony Semiconductor Solutions Corporation
an 1/3" or an 1/2.5" Sensor ?

Now you know the way to discover What Sensor inside this cam.
Pentax Q for astrophotography beginner? - Page 3 - PentaxForums.com
you just have to Download its FirmWare... :p

Relative Area of Astro-Cams and Cameras Sensors :
1/3" is a little more than half a 1/2.3" (Q, Q10)
1/3" is a little less than half a 1/1.7" (Q7)
Forum: Pentax Q 10-19-2018, 10:54 AM  
Pentax Q for astrophotography beginner?
Posted By geo444
Replies: 55
Views: 7,413
Hi Barondla ! ;)
Yes, I did some research about their Sensor... but couldn't find any infos ?



What they call Astro-Photography on DPR is generally " Under the Sky " - Night-Landscapes :
Nikon D810A: An astrophotographer's perspective: Digital Photography Review
so they can't appreciate the usefulness of Small Sensors...



Any idea about the Sensor inside the NANO1 ? :cool:

My site is down these days ! :o

;)
Forum: Pentax Q 10-05-2018, 03:28 AM  
Pentax Q for astrophotography beginner?
Posted By geo444
Replies: 55
Views: 7,413
Thanks Barondla ! ;)

Now You & Everyone else are able to Disassemble the Q10 v1.03 FW !
- just go to : Pentax-Q10-FirmWare-disassembly
- please, read the page, just to know what's where...
- download the 10 first files of the disassembly = DisasQ10v103.zip (0.57MB)
you'll get the necessary mapfile.txt and 3 other useful .txt files...
- download the 2 hacks of Acade's disassembler : DisasMips012.zip (0.05 MB)
the original disasmips0.exe from Acade couln't handle the huge FW size...
- simply folowing the indications : just redo my Dec-15-2014's disassembly !
- you want to compare your 270 resulting files with mine :
please write to the mail@ in the 'Help-Astro' page
and I'll send you the 270 files.zip (35 MB)

Be the 1st to disassemble the Firmwares of the Q, Q7, QS-1 ! :cool:

Who starts to download DisasQ10v103.zip & DisasMips012.zip just to check ?

Thanks ! ;)
Forum: Pentax Q 10-04-2018, 03:52 AM  
Pentax Q for astrophotography beginner?
Posted By geo444
Replies: 55
Views: 7,413
.
5 weeks working hard (Not eight days a week !) to gather everything I wrote on my Old PCs...
... all about Pentax Q10 Firmware v1.03 Disassembling since... August 2014 :
Pentax-Q10-FirmWare-disassembly
and this long page is... not finished at all...
Feel free to criticize !

Jeb decompiler, ok, thanks for the info ! ;)


.
Thanks kayakfari, and thanks for supporting this work ! ;)


.
Now I'm able to access your site with Both Providers I have : it's Not a Local Problem !
I'm taking a look at your Pentax Q disassembly operation... Very Useful !
Is there a place to discuss these Access Problems on Pentaxforums/forums ?




.
You shouldn't bother about the Q IR-filter, I'll write a page as detailed as I already did...
... just a few days to complete the Q10 Firmware Page... and... I'm in !

I was affraid to Forget or to Loose important infos or tips about the Pentax Q10 FW Disassembling
- a Huge Work... 5-7 days and I'll feel good ! ;)
Forum: Pentax Q 08-20-2018, 02:04 PM  
Pentax Q for astrophotography beginner?
Posted By geo444
Replies: 55
Views: 7,413
.
Thank you very much KayakFari !

[humor] :)
Did you see (page-2) the Q10 succeeded with Messier-57 in Lucky-Imaging Mode ?
- Lucky-imaging Q10 Mode was 1 or 2 sec Exposures @ ISO 6400 -
Q10 did preserve M57's whole set of RastaFari Colors :
M57's RastaFari full Color set from special Super-Pixel Mode
M57's RastaFari full Color set from standard Bilinear Interpolation
RastaFari flag : Red-Yellow-Green
[/humor] ;)


.
I did remove its IR-cut filter when I shot IC-5146
Pentax Q10 succeeded with IC-5146 = Invisible Nebula
30 sec. exposure @ ISO 1600, I couldn't see anything but Stars...
Even after 56 x 30 sec. stacked, one can hardly guess the Cocoon Nebula :eek:

This was ~4 years ago, the How-To is archived on my old PC-XP :
My previous post just above
but as it's a very important Modification for Astro-Photo,
I'll add a detailed full page on my site ASAP !
(weather back down to usual T°C next saturday)


.
Can't generally access to wordpress.com + now to kayakfari.com !
Nor via SFR provider !.. neither via Free provider ?!
Are both links in local access only ?
Net Neutrality USA restricted internet access - Google Search
Let us know kayakfari...

;)
Forum: Pentax Q 08-19-2018, 01:20 PM  
Pentax Q for astrophotography beginner?
Posted By geo444
Replies: 55
Views: 7,413
Thanks, many more informations to come...



Thanks Binth ! ;)
Yes, impressive 2 ways verified numbers for these Pentaxung cameras... :p

Sorry I was so loooong for the page #2... but we had a Very Very Warm Endless 3-Weeks ! :(
Early morning at 27°C... Late evening at 30°C... very hard to sleep few moments...
Totally unthinkable from my North Celtic origin ~17°C Max Summer !
I tried AstroPhotos, my HEQ5's Electronics shut off...

My old PC-XP had overheat problems too : Unable to find the photos I took 3, 5, 7 years ago...
So I decided to begin with the Most Recent ILC I dealt with : the Samsung NX mini !
Thus, I downloaded the 2 Main Pictures I posted on forums for this ILC...

So here is the Samsung NX-mini IR-Cut Filter Removal page just uploaded :
http://mecastronics.free.fr/SamsungNXminiTOP.html
NX-mini is Top-Camera + Pro-Sensor...
~$150, unbelievable !

You found something wrong, incomplete, contradictory, don't hesitate to mail it to me
http://mecastronics.free.fr/

;)
Forum: Pentax Q 07-24-2018, 02:13 PM  
Pentax Q for astrophotography beginner?
Posted By geo444
Replies: 55
Views: 7,413
.
I forgot the 2 Sensitivity Tables to summarise all I've written here and there on forums...
Maxi Astro (Ciel Profond) au NX mini...
= Nights & Days to gather, write and verify everything...
+ it's my first HTML Tables !


.
Hi Barondla : I was just working hard on it !
Now do you see 1 Page with the 2 Sensitivity Comparison Tables : ISO/mm˛ + mV/µm˛ ?
DIY pages will come next...

Site : mecastronics.free.fr


.
Thanks to support my Site Kwb ! ;)

If you find discrepancies or errors or whatever seems obscure : Please to report it here in this thread !

Thanks, now it's time for me to sleep zzzZZZzzzZZZ...

:D
Forum: Pentax Q 07-16-2018, 10:43 PM  
Pentax Q for astrophotography beginner?
Posted By geo444
Replies: 55
Views: 7,413
.
Many Thanks for your interest Barondla ! ;)
I think maybe it just takes time to be available over the whole www ?
On one of my PCs, I just got it only after midnight here ( Paris Summer Time ) !
Yesterday, I thought it had a "Bug", but couldn't find any...

Another indirect Acces could be Via the free.fr Site-Data-Base :
Googl' this : pagesperso.free.fr/Sciences/Astronomie
Choose : Résultats par page : 50
Select : Evaluation Visiteurs Ascendant, then clic on the '>'
Go to Page Bottom and clic on Page #9
It's on the 7th last line : mecastronics Ajouté le 17/07/2018
or on the right side : http://mecastronics.free.fr

At this time, even Googl' ignore my site ! :o
Site : mecastronics.free.fr
Wait & see...

PS :
Last Nights : Strict Application of all the Tips in my site improving the Pentax Q10's IQ :
= No Light Pollution Filter > ISO 800 at F4.7 on the Skywatcher 254/1200
But Huge Turbulence : +50% of the DNGs were discarded
- only 44 x 30 sec. ISO 800 on Messier-27
.

.
not so bad for only 22 minutes of exposure ?
... except some inflated stars !
eqv FL 6720mm

Now imagine the same work on a ~3360mm at f/2.4 :
https://www.pentaxforums.com/forums/136-pentax-q/369368-pentax-q-astrophotog...ml#post4351053

;)
Forum: Pentax Q 07-16-2018, 02:01 PM  
Pentax Q for astrophotography beginner?
Posted By geo444
Replies: 55
Views: 7,413
.
My Site to improve (DIY) your Pentax / Samsung "Astro-camera" :

Electro-Opto-Mechanical easy Mods to improve your Pentax, Samsung "Astro-camera"

I'll have a hard-working August month to fill this Site ! :lol:
- hundreds of text lines to write...
- tens of photos to well illustrate the text above...
- tens of verifications to see what happens if a beginner just applies this...



I would love to see yer Astro-photos after DY all these improvements to yer Pentax / Samsung ! :p

From now, Budding Astrophotographers are not going to stay "Beginners"

The link had a bug (?), now it works fine, enjoy ;)

Site : mecastronics.free.fr

:cool:
Forum: Pentax Q 07-13-2018, 08:04 AM  
Pentax Q for astrophotography beginner?
Posted By geo444
Replies: 55
Views: 7,413
.
Thanks Barondla ! ;)
The Results are exactly as Good as expected in my Starvis-Score ranking...


.
You won't be disappointed !
In case, I'll give you all the tips that greatly improve these Q(x) for Astro-Photos :
- how to Remove their IR-Cut filter w/o disassembling
- how to fit a Standard 1"1/4 Filter inside their Pentax K4Q Adapter
- how to make your EQ Mount Steady as a rock !
- how to prevent Sensor Heating, so LENR
- how to avoid Light Pollution Filter
- etc, etc...

LENR : Long Exposure Noise Reduction,
generally a Dark-Frame subtraction Doubles the Exposure
+ Smoothing NR increases

---

Messier-57 Ring Nebula, apparent size 1 x 1,4 arc-minute, 2300 L-Y from Pentax Q10
Pentax Q10 Lucky-Imaging on M-57 = 108 x 2 sec. subs + 68 x 1 sec. exposures, ISO 6400 all !
DSS set to Standard Bilinear Interpolation ; Down Left = 100% crop of M-57
Some details missing because NR can't bet set Off !
Right click View-Image to Download :
.

.
Just imagine how fine and sharp details and stars would be...
if I were Not at Marseille with such an Agitated & Turbulent Atmosphere ? :eek:
Here are only 4 min 44 sec total exposure !

;)
Forum: Pentax Q 07-11-2018, 12:44 PM  
Pentax Q for astrophotography beginner?
Posted By geo444
Replies: 55
Views: 7,413
.
So Pentax achieved a tiny progress on the Q-S1 FirmWare... just before the extinction of the Q family... :o
I set the 30 sec. exposure in Manual Mode which works from the IR Remote !
.

.
Not many Science Fiction among TV programs when I was young... :( but...
I have read many Short Stories coming from "Weird Tales" and compiled into the French Mag. "Fiction"
My favorite author was " Theodore Sturgeon " !

What's really missing in Science Fiction literature...
... no one has never predicted we could get amazing Astro-photos from...
such a tiny camera as a Q10 !

---

Pentax Q10 Lucky-Imaging on M-57 = 108 x 2 sec. subs + 68 x 1 sec. exposures, ISO 6400 all
DeepSkyStacker in Super-Pixel Mode* ; Down Left is a 100% crop of M-57
Some details missing because NR can't bet set Off !
Right click View-Image to Download :



Super-Pixel Mode = No Interpolation, Pixel Color is taken from 2x2 Pixel RGGB matrix :
DeepSkyStacker - Technical Info
Resulting image Area = initial RAW Area / 4 !

Just found back the copy of DSS parameters before Stacking, see attachment ->
= only 4 min 44 sec total exposure !

Enjoy this tiny Pentax Q10 that no Science-Fiction never predicted ! :p

;)
Forum: Pentax Q 07-09-2018, 01:16 AM  
Pentax Q for astrophotography beginner?
Posted By geo444
Replies: 55
Views: 7,413
.
Hi 2old4toys ! ;)

A FirmWare Hack was my 1st idea years ago, so I managed a Q10 FirmWare Disassembly to begin with
Many thanks to Acade for his tool : http://acade.au7.de/disasmips/disasmips.htm
I totally succeeded in that huge work inside the Q10 FW :

Files, Functions Statistics, Call Statistics, Symbol Map :
+ 0268 HTML Files : Calls are hyperlinks
+ 2886 Total Functions
+ 3197 Call Targets
+ 1185 Map Symbols
= 130 MB of Files to work with... that I will email to every FirmWare Hacker who asks for :cool:
Just remember it's a MIPS RISC Processor inside the Pentax Q(x) !

A " C " De-Compiler would have been more useful in issuing " Friendly Readable " Smaller files...
But I never could find a " C " or " Pascal " De-Compiler tool for free ?
Who knows one that reads MIPS objects ?
???

The reason why Electronic Shutter Exposures are limited to 2 sec....
is the same that ISO 6400 Max Exposure is 2 sec.
= Noise increase !!

Electronic Shutter on a CMos sensor needs More Transistors at work for Each Pixel !
Here they are 12.4 Million Pixels on a 4.6 x 6.15 mm IC...
thus the Noise increase !


.
More simply, one could use a (PK to) T2 Adapter, as I do...
... But that Won't upgrade your Telescope up to a ~3360mm f/2.4 Newtonian ;)
to Overcome the 30 sec. limitation of the Q :
https://www.pentaxforums.com/forums/136-pentax-q/369368-pentax-q-astrophotog...ml#post4351053

The IR Remote won't work in Bulb mode on Pentax Q :
https://www.pentaxforums.com/forums/6-pentax-dslr-discussion/274316-pentax-h...ml#post2957675

No Way to skip Random-Dark-Frame Subtraction if Ambient Temperature reaches ~25°C
... or if you've just over-used the Live-View for framing & focusing !
unless returning to the FW Hacking solution...

;)
Forum: Pentax Q 07-07-2018, 02:51 AM  
Pentax Q for astrophotography beginner?
Posted By geo444
Replies: 55
Views: 7,413
.
0.666 Devil's Speed Booster 4 Pentax Q... + Mechanical Shutter !
Note: 0.666 Devil's Speed Booster 4 PQ to Nikon F will do the job as well
.
This would be Very Useful for Astro-Photography...
the SkyWatcher 254/1200 is a very affordable Excellent f/4.7 Newtonian...
with 0,666 Devil's Speed Booster 4 Pentax Q it would become
2.8x 1200mm = ~3360mm at f/2.4 to Overcome the 30 sec. limitation of the Q !

Even if lowering the ISO setting down to ISO 800 !
- all my Galaxies & Nebulae were shot with the Q10 at ISO 1600 at f/5 :
Photos tagged with "iso-1600": Galleries: Digital Photography Review = geo444
which is a little too much to avoid the +30sec-LENR* when Temperature is over ~24°C
+30sec-LENR = in body Dark Frame subtraction

No Need to implement a Physical Mechanical Shutter inside the 0.666 DSB4PQ...
just make believe the Pentax Q "there is a Mechanical Shutter in the 0.666 DSB4PQ",
because for Astro-Photography there is No Need of a Physical Mechanical Shutter...
but just : Start / Stop Exposure... Build Raw File... Write Raw File on the SD card !

In fact, make believe the Pentax Q "there is a Mechanical Shutter in the 0.666 DSB4PQ",
just means (x?) Electronic Contacts that respond with the Correct Voltage when required

Who has some knowledge about the Protocol between the Body and the PK-Q Adapter ?
- just for the specific part "is there a Mechanical Shutter in this Adapter" ?

what do you think about that 2old4toys, AstroDave, Mikesul, Barondla, others ?
an affordable ~3360mm at f/2.4 for our Pentax Q ?

;)
Forum: Pentax Q 07-04-2018, 12:42 AM  
Pentax Q for astrophotography beginner?
Posted By geo444
Replies: 55
Views: 7,413
.
Hi 2old4toys, what we know for sure is :

- Selecting Pentax 1/2.3 + 1/1.7 sensors in DxoMark DataBase we see
the 1/1.7" sensor has a 208 DxoISO score instead of ~280 as it's 50% larger than the 1/2.3" in the Q, Q10 :
Verification of the Direct Relationship from Sensor Area to DxoISO all other things equal
( Pentax Q + Q10 DxoISO = ( 183 + 189 ) / 2 = ~186 )

Can't go deeper with DxoMark as they didn't Test the Pentax Q7 & QS-1 :
My Comment on " DxoMarketing " : http://disq.us/p/1nnzyyb

- if the 1/1.7" sensor had the Starvis-Score of the 1/2.3" sensor
it should have a : 208 * 3354 / 2454 = ~284 DxoISO !
Starvis-Score & DxoISO seem Correlated
.

.

.
A CMos Sensor is a Highly Programmable Device, so
the only way to know What's the Sensor inside a Camera is to
look inside the FirmWare with an Hex-Viewer by downloading an Update
here is an example with the Q10 FirmWare
Verification of the imx078cqk
see attachment
.
Forum: Pentax Q 07-03-2018, 11:30 AM  
Pentax Q for astrophotography beginner?
Posted By geo444
Replies: 55
Views: 7,413
.
Thank you very much Mikesul ! ;)


.
Thank you very much Barondla ! ;)
as I said 2 posts before :
these tiny sensors are Very Sensitive ~ DxO ISO 5680 FF-Equivalent for the 1/2.3" in the Pentax Q, Q10 !
=> see Pentax Q10 sensor ranking among the Sony Starvis Sensors below ->


.
No reason the Q won't succeed with Planets : they are Hundreds of times Brighter than Galaxies / Nebulae !
you'll have to use the Q, Q10 in Video-Mode, then Convert the AVI file to PNG pictures
then you'll have to Discard every blurred picture to keep the best
then download RegiStax* or a similar Stacker...
Good Luck Barondla...

DeepSkyStacker align different subs using the Bright Stars Relative Coordinates
RegiStax align the pictures ignoring the dimmer stars
because of Shorter Exposure



Don't worry about Noise, Planets are Bright, you'll have to Reduce Blurring instead ! ;)
- the Max Apparent Size of Mars is less than 25 Arc-Second...
watch 8.5 Arc Second on my M-106 :
https://www.pentaxforums.com/forums/136-pentax-q/369368-pentax-q-astrophotog...ml#post4342865

Pentax Q10 sensor ranking among the Sony Starvis Sensors
:



Sony Starvis Criteria : BSI Sensors > 2000 mV / µm˛ @ f/5.6 in 1 sec. exposure :
CMos Sensor Sensitivity Measurement = MilliVolts per SquareMicroMeter = mV / µm˛ @ f/5.6 in 1 second accumulation
Datas from Sony Sensors Specification Sheets

Verified Calculations are here :
Maxi Astro (Ciel Profond) au NX mini...
Maxi Astro (Ciel Profond) au NX mini...


;)
Forum: Pentax Q 07-02-2018, 07:14 AM  
Pentax Q for astrophotography beginner?
Posted By geo444
Replies: 55
Views: 7,413
.
Thanks Dave ! ;)

DeepSkyStacker will not be a problem, it will simply do the job as usual :
http://deepskystacker.free.fr/english/userguide.htm
IMO, the simplest Stacking Tool

my BIG problem at Marseille is the Atmosphere's Stability
with your DA* 300mm on a Pentax Q, you'll see the Stars Blinking, Ok !
with a 1000mm you'll see the Stars Dancing...

( 1000mm on a Pentax Q = the same Reach as a Celestron C14 on an APS-C ! )

Many times, I've had to Trash ~ 50% of my 30 sec. subs ~
Here, the Sun Heats the Sea all the day long for more than 300 Days per Year,
at Night, usually the North Wind brings Cold Air over the Warm Sea !

The Precision / Sharpness of your Results depends on your Atmosphere's Stability...
- else it depends on your Determination to Trash every Blurred Sub ! :(

M-106 Galaxy : ~25 Million Light-Years from Q10 - apparent core size 2.5'x 6'
Magnitude minus Air- and Dust- and Light-Pollution worse than 10 ?
M-106 Galaxy : Q10 + SkyGlow Filter + Skywatcher 200/1000 = 88 x 30 seconds @ ISO 1600
Stacking = DeepSkyStacker 3.3



I highlighted 2 Stars close to the Galaxy :
- the Yellow one named USNOA2-1350-08095435 : Magnitude 17.3
- the Blue one named USNOA2-1350-08095450 : Magnitude 17.1
the distance in between is about ~8.5 arc second

Dumbbell gets More Pixels :
Messier 27 as seen from a Canon Eos 20d = 2.4 MPixel / cm˛
-vs- shot by the Pentax Q10 = 44 MPixel / cm˛
Both were shot at ISO 1600 :
https://www.dpreview.com/galleries/7467909648/photos/3037792/dumbbell-gets-more-pixels

Good Luck ! ;)
Forum: Pentax Q 07-02-2018, 12:55 AM  
Pentax Q for astrophotography beginner?
Posted By geo444
Replies: 55
Views: 7,413
.
The Pentax Q(x) with their tiny sensors are Not at their best for Wide Field Astro-Photography
for Wide Field, you'd better use an APS-C (or a FF) sensor !
+ you'd find more choice in (Ultra-)Wide-Angle lenses for large sensors (Samy)

But the Pentax Q(x) with their tiny sensors are at their Best for Long Reach Astro-Photography
Why ?
Simply because thousands of Deep Sky Small Objects will Never fill an APS-C sensor !
Even mounted on a very affordable SkyWatcher 1000mm Newtonian !
+ these tiny sensors are Very Sensitive ~ DxO ISO 5680 FF-Equivalent for the 1/2.3" in the Pentax Q, Q10 !

a Pentax Q10 w/ the Pentax Adapter on a Skywatcher 200/1000 Newtonian :
= 50 x 30 seconds @ ISO 1600 stacked with DSS 3.2
it's Messier 27 Nebula at 1350 L-Y :



Other (9) Long Reach Astro-Photographies taken with a Pentax Q10 :
The Astro-Q Club! - Page 10 - PentaxForums.com

Good Luck ! ;)
Forum: Pentax Full Frame 04-19-2018, 02:41 AM  
a Full-Frame System MILC to boost Pentax market share...
Posted By geo444
Replies: 85
Views: 11,189
First, Congrats to you Rondec for your perfect illustration of...
" Pentax Image-Quality Power " ;)



I mostly agree with all that...
Except that Sony-Camera is somewhat the Champion of Complications ! :lol:

Try to google this :
« Sony A7, A9...
11+7-bit-Compression-Algorithm, 12-bit-Crippled-Raw, AA-Filter-Reflection, Banding, Blinking, Compression-Artifact, Cooked-Raw, Concentric-Banding, PDAF Striping, Raw-Cooking, Sensor-Reflection, Shutter-Shock, Star-Eater, Star-Eating, Striping... »

Don't google all the items at the same time : google is an " Advertising Placing tool "...
... Not a " Search Engine " as they advertise it ! :D

Each New Sony Camera seems to invent a New Problem !
From the Sensor to the RAW File, Sony-way is a Labyrinthic Process

Finally, a Firmware Update (which is Complicated too) solves the Problem, but...
From the Sensor to the RAW File, things are so Simple and Understandable with... Pentax !
Don't you think so ?

;)
Forum: Pentax K-5 04-18-2018, 05:07 AM  
K-5 For Astrophotography
Posted By geo444
Replies: 1,092
Views: 269,510
.
To answer the "what else" question, I summarized :
- the Top-8 Cameras with lowest Detection-Threshold < 0,01% @ 0dB SNR, from DxOmark
same as in my previous post, ordered by Measured-ISO
- the Top-8 Cameras with lowest Noise-Levels in 5 min. Dark-Frames
from The Sensor Noise DB. – Brendan Davey Photography
ordered by their Noise-Mean-Value

Pentax K-1, the 95 Top Measured-ISO with a Detection-Threshold of 0,009% @ 0dB SNR
+ the 2nd Noise-Mean-Value just behind the Pentax K-5 in 5 min. Dark-Frames (+5ev)

The very Low Dark-Current levels of the Sony imx071 explain the Pentax K-5 Top position
= the 1st lowest Noise-Mean-Value in the 5 min. Dark-Frames (+5ev) test
the Dark-Current Chart is from the Zwo Astro imaging site :
https://astronomy-imaging-camera.com/products/asi-cooled-cameras/asi071mc-pro/
Same Sony sensor, at a $1700+ price !

Then the Asi071(K-5) compared to the Asi294 and Asi1600
= two Astro-Cams with 4:3 ~22,7mm diagonal sensors

High ISO settings are mandatory to lower the Exposure Time to 1 sec. or less
this to cancel the Atmospheric Turbulence effect with long FL.
the only way to operate with Lucky Imaging !

But finally, what do you lose from Base-ISO to ISO 10K :
- Dynamic Range value from 14 ev down to 7 !
- Tone Values from 16384 down to 128 !
- SNR to be Half the Base ISO SNR
- your RAW File Size doubles
- for the same final IQ, you'll have to Stack much more RAWs...
- with Dark-Frames !
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