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Forum: Pentax K-1 & K-1 II 04-03-2021, 12:09 PM  
Accelerator unit struggling at high ISO and mid-power battery?
Posted By geo444
Replies: 36
Views: 1,702
@bdery, apologies for this off-topic post...


.
Hi MJKoski ! ;)

Accelerator Unit Active w/ Long Exposures at ISO100 : are you absolutely certain of that ?
... Could you Clearly proove that ?... From your own Raw files ?
That would be a Very Usefull Knowledge...

It's important because it would mean there is No Solution for Astrophotography w/o Smoothing out faintest stars
- ISO > 639 and Short Exposures = Raw-NR / Smoothing
- but, at Base ISO-100 and Long Exposures = Pentax Raw-NR / Smoothing too !

It's not only a limitation for the K1-Mk2, native or rebuilt...
... it's a limitation for the new K3-Mk3 too !

the first Words of DPReview's Presentation were the K3-Mk3 had the imx571 BSI sensor, and...
- at the same time - the K3-Mk3 had the Accelerator Unit too !?!? :eek:

After reading this, I made the following remark to DPR's staff :
Pentax K-3 Mark III initial review: Digital Photography Review
the imx571 featuring the Dual Gain Mode doesn't need any Accelarator Unit to bump up its DR curve at ~ISO-640 !
For instance: Canon Eos R5 Stops Raw-NR at the ~ISO-setting Pentax K1 II Starts it :
Photographic Dynamic Range versus ISO Setting

As a result of which, they withdrew the - imx571 BSI Sensor - statement from their Presentation...
I strongly hope the K3-Mk3 will escape this Accelerator Unit that allows Pentax to only
imitate New BSI Sensors with old sensors : K-5, last Pentax DSLR that got the Best Sensor at its time !

I need a Pentax K-3-Mk3 as Excellent as the K-5 was 11 years ago :
5500 light years : Rosette, the Stellar Nursery ! : Digital Photography Review
shot from a Bortle-9 city at sea-level with a Stock K-5

So, is Accelerator Unit also Active during Long Exposures at ISO100 ?
- to be continued in another thread ?...
thanks to MJKoski...

;)
Forum: Digital Processing, Software, and Printing 04-01-2021, 04:07 AM  
Camera Simulator, Exposure Calculator : SLV -25 to 30 Ev mini.
Posted By geo444
Replies: 6
Views: 2,804
Hi All ! ;)

I've tried several times to put a link in the comments of that Good Article :
The Fundamentals of Exposure - Introduction - In-Depth Articles
... Article wich contains almost Everything about Exposure...
Everything except a LV Calculator like this :
Camera Simulator, Exposure Calculator, Light Value -49 to 69 Ev.
to Calculate, Manipulate and Play with : Aperture, Shutter-Speed, ISO, Light Value...

it's still not allowed at all :
" Your comments cannot contain URLs. Please remove any links and re-submit your comment."

So now, there is at least a link here - in the LV Calculator's thread - to that Useful Article :
https://www.pentaxforums.com/reviews/exposure-beginner-guide/exposure-settings.html
the latter - Exposure Settings - containing several examples to verify here :
http://mecastronics.free.fr/ExposureLightValueVCam.html

;)
Forum: Pentax K-5 & K-5 II 12-21-2020, 12:01 AM  
K-5 For Astrophotography
Posted By geo444
Replies: 1,118
Views: 314,753
Sorry, I just forgot 5 words here :
.

.
The Closer to Base-ISO 80, the More it's True...


.
I think I understand where the Noise comes from :

F/2 is Good, it's the aperture I would have choosen too...
ISO 400 is Good too... I think you can go until 800...
3/5 sec. is way Too Short Exposure given the 3 other Parameters

Camera Simulator, Exposure Calculator, Light Value -49 to 69 Ev.

Please go to this page... then select 1/3 Ev Steps...
then select 02 Ev Dark Streets at Night, Dark indoor...
then select F/2... then select ISO 400... then select 1/1.6 sec.~3/5
then click on CalcSLV = Compute Scene Light Value an you get 0.7 Ev !

The whole Range of my Astro-Photos is within - 3.5 Ev down to - 6 Ev !
Photos tagged with "nx-mini": Galleries: Digital Photography Review
Photos tagged with "iso-80": Galleries: Digital Photography Review

I would have choosen at least 2 to 4 sec. for the Exposure duration :
4 sec at ISO 800 at F/2 click CalcSLV that gives - 3 Ev !
given the downsizing you applied to your pic.


.
So this was shot within the Hottest and shortest Nights ?

What was the " Camera Temperature " recorded in Exif Datas ?
if ExifTool is on your PC, the Command Line is :

" Exiftool -T -FileName -T -CameraTemperature *.PEF "

Thanks DrMindbender ;)
Forum: Pentax K-5 & K-5 II 12-18-2020, 04:20 PM  
K-5 For Astrophotography
Posted By geo444
Replies: 1,118
Views: 314,753
Wow ! Congrats for that Huge Job, DrMindbender !
- At which F/ - ISO - SS were they shot ?

If ISO-setting was just a Preset...
... I would suggest you to re-build this stack at lower ISO-setting...
I bet you would get less noise in the final picture...

I think the K-5 is at it's best at ISO~800...
... many users say beyond that, its just Digital Gain...
so it's better applying the Digital Gain by yourself, after stacking ?

ie: when the SNR is Maximised ?
Don't you think so ?

K5s don't fear Under-Exposure at all :
Photos tagged "ISO-80": Galleries: Digital Photography Review
- the First ISO-less DSLRs

;)
Forum: Non-Pentax Cameras: Canon, Nikon, etc. 11-06-2020, 03:49 AM  
6x6 SLR systems under $1,000 - Bronica S2, Kowa Six, Mamiya C220
Posted By geo444
Replies: 24
Views: 1,363
.
Good : it's the very Affordable and Reliable entry level model ! :cool:


.
That is not a final problem !
Each PS Lens you'll buy later will work in Time (T) Mode
.
Forum: Non-Pentax Cameras: Canon, Nikon, etc. 11-05-2020, 12:19 PM  
1 inch sensor club
Posted By geo444
Replies: 261
Views: 25,999
.
Maybe it's Not a Paradox ?
-1) Clever Livings that are Not Aggressive : like peaceful whales on a planet covered with oceans...
... so their planet stays in good shape for millennia... but we'll Never heard of them...
-2) Very Aggressive Clever Livings as we, Humans, are - so they Destroy their planet after a few centuries...
... just a few centuries with the Richest part consuming more than 3 Planets could provide...
Exactly what we are Experiencing these years on our own planet !


.
Bravo ! Excellent quality pictures that look like shot with a DSLR ! :)

But the DSLR-size SuperZoom is sometimes too bulky...

I always thought Pentax could have launched a Pentax Q+... not that bigger than the original Q...
... but... built around one of these Super Performing 1 inch BSI sensor ...

Advocacy for a Non-crippled Pentax Q+ w/ 1" BSI sensor inside

Advocacy for a Non-crippled Pentax Q+ sporting a 1" BSI sensor

The Best Camera is this small one you carry every time, everywhere with you !

From nearly undetectable w/ a pancake lens mounted for Street or Concert Photography...
... to that very affordable huge Sky-Watcher 254/1200 for HQ Astro-Photography :

F11 + Right Click + View Image :
.

.

;)
Forum: Non-Pentax Cameras: Canon, Nikon, etc. 11-05-2020, 04:03 AM  
6x6 SLR systems under $1,000 - Bronica S2, Kowa Six, Mamiya C220
Posted By geo444
Replies: 24
Views: 1,363
.
I do understand your prerequisite...
Here is a Very Interesting Bronica Accessory for the GS-1 that could solve the dilemna...
search?q=Bronica+GS-1+Revolving+Tripod+Adapter+G&tbm=isch
keeps the target in the frame center when revolving

There is also an AE Rotary Finder G to hold the GS-1 to one's chest as a TLR :
search?q=Bronica+GS-1+AE+Rotary+Finder+G&tbm=isch
Incredible Bronica GS-1, indeed !

If you could find 1 of these Revolving Tripod Adapter G for Bronica GS-1 ?
Fingers crossed if this matches your prerequisite ?

;)
Forum: Non-Pentax Cameras: Canon, Nikon, etc. 11-04-2020, 12:03 PM  
6x6 SLR systems under $1,000 - Bronica S2, Kowa Six, Mamiya C220
Posted By geo444
Replies: 24
Views: 1,363
Hi Angelic ! :)

Before buying a Pentax 6x7 in '81, I bought a Mamiya C220f with 3 lenses...
... But, they were So Soft, especially the 135 mm, that I brought it Back to the shop !
I traded it for a Pentax 6x7 with a 90 and a 150mm, both F/2,8
= Fantastic Colors and Contrast and Sharpness !!!
SMC-Pentax-67-TelePhoto-Prime-Lenses
SMC-Pentax-67-Normal-Primes

The only Limiting Specification of the Pentax 6x7 was its Slow 1/30s Flash Sync...
... So I searched for a ~similar Camera~ with Very Good Lenses...
but especially a Fast Flash Sync Speed, 1/500s ?

This is how I found the Bronica GS-1 : a Modern and Versatile Camera !
- its Excellent Lenses are said to be from Nikon Designers :
google.com/search?q=Bronica+GS-1+system
you just have to Swap 2 wires in the Speed-Grip to use all Nikon SB-Flash in Computer Mode

The GS-1 is not that much bigger than the SQ-A...
... and the SQ-A is not that much cheaper than the GS-1...
Bronica GS-1 versus SQ-A - Google Search

Just an annoyance... maybe...
I won't sell mine !
;)
Forum: Non-Pentax Cameras: Canon, Nikon, etc. 11-03-2020, 05:29 AM  
1 inch sensor club
Posted By geo444
Replies: 261
Views: 25,999
.

People living in M51, if there is any, are taking a look at our Earth through a Giant Telescope and they just see Brontosaurs,
Dinosaurs, Tyranosaurs, one " Whirlpooler " says to his friend « you see, nothing that looks like clever livings on Earth ! » :o
.

M-1 Crab Nebula, apparent size 6'x4' magnit. 8,5 is only 6500 Light-Years from Earth ! It's the remains of the summer 1054
explosion of a SuperNova, Chinese astronomers said it was 6 times brighter than Venus and about as brilliant as the full Moon.
.
F11+ Right Click + View Image :


.

Messier-1 : Sky-Watcher 254/1200 + Samsung NX-mini at prime focus - No Filters used,
ISO 400 = 30 subs of 4 min. each Stacked + Levels to Highlight these Green Extensions.
2020 winter's weather conditions were totally appalling ( Windy ) hence the inflated stars.
I am the only one to show these Green Extensions around the left side of Crab Nebula !
.

How to do Astro-Photography with very little money :
Electro-Opto-Mechanical DIY to improve Pentax, Samsung cameras...
No cookies, 100% free site !

;)
Forum: Pentax K-5 & K-5 II 11-03-2020, 04:03 AM  
K-5 For Astrophotography
Posted By geo444
Replies: 1,118
Views: 314,753
.
Thanks Rick ! Here is M-17 Omega Nebula ;)
.


.

Messier-17 Omega Nebula in 1824 × 1280 pixel, taken through a Hazy Sky :
https://en.astronomike.net/1240578.jpg?20200309
... 2nd sub guiding failed !

Omega Nebula with its Datas here :
M-17 - Pentax K-5 iso 80 = 4 x 12 min - Pollution Lumin. Maxi :
M17 - Pentax K-5 iso 80 = 4 x12 min - Pollut° Lumi Max - Nebulae - Astronomy AstronoMike.net

That was shot through a Sky-Glow Neodymium Filter, not efficient enough !
Next time, I'll try the UHCs Filter, more able to extract the Nebula from Light Pollution...
dpreview/galleries/7467909648/photos/3227971/rosette-pentax-k5
... and increase Exposure duration up to 15~16 minutes...

Price to pay with an UHC Filter is that it's Very Difficult to use
Even after 17 min. Long Exposure, you can't see anything but Bright Stars :
https://www.cloudynights.com/gallery/sizes/32054-pk5lv-5-6/large/
- Pentax K-5 UHCs - ISO-80 = 1007 sec.(17 min.) F/4,7
M-51 is Way Brighter than M-17 in Blues-Greens !

How to do Astro-Photography with very little money :
Electro-Opto-Mechanical DIY to improve Pentax, Samsung cameras
a 100% free site, No cookies at all !

;)
Forum: Non-Pentax Cameras: Canon, Nikon, etc. 11-02-2020, 07:18 AM  
1 inch sensor club
Posted By geo444
Replies: 261
Views: 25,999
.
Bravo : Splendid pictures here ! Especially Dogs, Landscapes, Mushrooms from Normhead,
Snow, Tree, Flower from Wpresto ( since P.3 " la Rose Trémière Mauve " ! ), etc...

Here is one of mine, from 37 Million Light-Years in Deep-Space...
2 Galaxies which are Meeting like... Hairy Monsters ?

30 Exposures of 4 min. each stacked
Samsung NX-mini, ISO 400
Messier-51 b+a :
.

.

Other details and sizes here :
https://www.dpreview.com/galleries/7467909648/photos/4098937/m-51-a-b-nx-mini

Enjoy ! ;)
Forum: Pentax Q 10-06-2020, 08:05 AM  
Now you can order a Metabones K to Q Speedbooster!
Posted By geo444
Replies: 108
Views: 7,986
.
If you need Long Exposure of 30 sec. for... hem... AstroPhotography ?
Photos tagged with "pentax-q10": Galleries: Digital Photography Review : Digital Photography Review
https://www.pentaxforums.com/forums/members/38890-geo444/albums/7415-photos-tests/
... it is a Mandatory Purchase !


.
As long as the Pentax Q could reach the 30 sec. Long Exposures in Electronic Shutter Mode...
... I think an Adapter could Simulate a Leaf Shutter without including one !
It just have to reply to the Q Body with the appropriate Signal...
= Through the Q Mount Electronic Contacts :
- Ok, Leaf Shutter Opened
- Ok, Leaf Shutter Closed

That may be a Very Interesting DIY Experiment...
~> see Q-Shutter.png attachement from
Pentax Q-S1 Review - Specifications | PentaxForums.com Reviews


.
I think from Q Mount to K Lenses, neither Autofocus nor Aperture Signals are Fully Compatible ?

For that price... at least, the Tripod Mount could have been included ! :cool:
.
Forum: Pentax Q 10-06-2020, 02:33 AM  
Now you can order a Metabones K to Q Speedbooster!
Posted By geo444
Replies: 108
Views: 7,986
Mail sent to GBI ltd. 12 October, 2017 5:07 pm

Hi All at metabones ! ;)

My question is about the Q666 Adapter for Pentax Q, Q7, Q10, Qs1 :
does the Q666 have a - Leaf Shutter inside it ?

If this Q666 does have a - Leaf Shutter inside it, it's Very interesting for Astro :
my ~5600 mm F5 (~$200 1000 mm Newtonian) becomes a ~2800 mm F/2.5 !
allowing me to bypass the Sensor 30 sec. limitation by getting 4 times the light.
( I strongly hope so... )

If it doen't have a Leaf Shutter, the limitation is worse, it is down to 2 sec.,
making the Q666 of No interest at all for AstroPhoto. ! Here is why:
Pentax Q-S1 Review - Specifications | PentaxForums.com Reviews
see Shutter Speeds section ->

8 Astro-Photos shot w/ the Pentax Q10:
geo444: Galleries: Digital Photography Review : Digital Photography Review

Many Thanks for your answer...

Metabones-sales -13 octobre 2017, 05:12, Alex, GBI Ltd

Hi,
Sorry !This Q666 speed booster have Not Leaf Shutter inside.

Thankyou !

Alex, GBI Ltd
Forum: General Photography 09-29-2020, 02:31 PM  
Actual shutter speeds versus "standard" values
Posted By geo444
Replies: 17
Views: 2,238
.
I don't know if it could help you, but I re-built my Camera Simulator, Exposure Calculator,
with Java-Script in spring 2019, just between the launch of this thread and now...
Useful to find Equivalent Exposures : Astrophotography purpose, etc...

the Camera Simulator, Exposure Calculator is here :
Camera Simulator, Exposure Calculator, Light Value -49 to 69 Ev.

and I hope all the explanations are here :
Camera Simulator, Exposure Calculator : SLV -25 to 30 Ev mini. - PentaxForums.com

;)
Forum: Pentax Q 09-28-2020, 01:52 PM  
IR infra red conversion for Pentax Q cameras
Posted By geo444
Replies: 29
Views: 19,096
.
Hand shaving the Bayonet Mount to be Perfectly Parallel is not so difficult...
... it would just take a somewhat longer time to achieve...
0,02 mm precision to be expected !


.
With or without the IR-cut filter in place, I think it's difficult to clean in both cases ?
... I always put a cap or a lens on my Q-10 to keep it clean !


.
AR Multi-Coated glass is mandatory for Astrophotography purpose :
... you often get Very Bright Stars in the frame, so...
you'll get Strong Light-Reflections between an Ordinary Glass & the Sensor's Glass !

> That's why I shaved my Q10's mount :
Pentax Q, Q-10 modified for IR-Landscape photography
... and, I am able to add every Astro-Filter :
1"25 Astro Filters inside Pentax K2Q Adapter


.
Congrats 2old4toys : #1 and #3 are Nice And Sharp !
+ isn't the #3 to show some... retro look ?

;)
Forum: Pentax Q 09-28-2020, 12:40 PM  
Pentax Q for astrophotography beginner?
Posted By geo444
Replies: 84
Views: 18,706
.
Wow !... Impressive Landscape under the Milky-Way !
... Was your Q-S1 w/o IR-cut filter or the night Not 100% Dark, or both ?
Is this place lit by the Light-Pollution ?


.
Is your scope a 1000mm Pure Reflector : Tube Length = ~900 mm~
... or some kind of " Catadioptric " Scope with Lenses in the focuser = Short-Tube ?
Catadioptric Reflector with Lenses in the focuser - Google Search

/!\ the Glass Element in the Focuser could be :
- some kind of Barlow Lens, could be Removed if you lengthen the tube ?
- some kind of Corrector that allows the use of a Spherical Mirror instead of a Parabolic one...
if you remove this Corrector, image borders will be blurred !
I hope it's Not one of these :
Black list of telescopes. Bad telescopes not for beginner

Tasco Galxsee 144500 Corrector ?
https://www.pentaxforums.com/forums/136-pentax-q/369368-pentax-q-astrophotog...ml#post4931112
it's not said that it has that Spherical Primary Mirror, so...
you still get one chance...
.

I wasted all the summer nights installing my Astro Gear in the yard of the building...
... and once everything was Well Settled and Ready for Astro-Photo...
the Clouds were Filling the sky from ~10 PM to ~2 AM !
:hmm: angry with all these climate skeptics

Nebulosity-Map history, location SE Marseille :
https://www.meteociel.fr/observations-meteo/nebu.php
some clear skies near the Full-Moon

So I came back to my site and completed some useful infos
1"25 Astro Filters inside Pentax K2Q Adapter
= how about 1"25 Filters in the Pentax K2Q adapter

Not even 1 astro-photo to post !
Forum: Digital Processing, Software, and Printing 09-22-2020, 04:22 AM  
Camera Simulator, Exposure Calculator : SLV -25 to 30 Ev mini.
Posted By geo444
Replies: 6
Views: 2,804
.
Camera Simulator, Exposure Calculator, Light Value -49 to 69 Ev.

Last spring...
I added three Control-Dials and one Lighting-Dimmer pictures
to say the most with the fewest words.

These days...
I added a link to the Fantastic Job done by Wayne Fulton :
- he filled the whole list from Precise Values to Nominal Values
for Shutter-Speeds, F/stops and ISO values...
= in Full, Half, Third, Third+Half, Sixth, Tenth stops...
with up to Nine Significant Digits !
Thanks to Wayne Fulton
.
On page How To :
Left / right key : Decrease / Increase Aperture, Shutter-Speed, ISO, SLV - Numbers
– / + : Decrease / Increase - amount of Light on sensor and/or image Brightness
Calc(ulate) : Aperture, ShutterSpeed, ISO, SLV from the 3 other values
3 Ev Steps: 1, 1/3, 1/6 - 12 Scenes: Light Value –6 Ev to 16 Ev
for 1/2 Ev increment, shift 3/6 Ev equivalent increment
This won't run w/o a Full JavaScript Browser
from Precise-Values to Nominal ones
- link to Wayne Fulton's page
.
Camera Simulator, Exposure Calculator, Light Value -49 to 69 Ev.
.
3 Control-Dials + 1 Lighting-Dimmer added :
Forum: Pentax K-5 & K-5 II 07-24-2020, 01:08 AM  
K-5 For Astrophotography
Posted By geo444
Replies: 1,118
Views: 314,753
...
Now, if you find this last 6x10 min. version a little too much...
I recently built a 3x10 min. M45 with far less noise than the older version
here is this 3 Exposures of 615 sec. each at ISO 80 with the K-5 :
.

.

A much larger M-45 picture, 2296 × 1504 is pixel-peepable here :
https://en.astronomike.net/1251525.jpg?20200602

... or with the Datas here :
Messier 45 - Pentax K-5 @ ISO 80 : 3 x 10 min. - SkyWatcher 200/1000 - Clusters AstronoMike.net
https://en.astronomike.net/deep-sky/clusters/1376725.html
.

It just sits between the first Noisy 3x10 min. version :
Pleiades M45 Pentax K5 geo444 Galleries Digital Photography Review

... and the last Electric Blue 6x10 min. version :
Pentax K5 M45 Pleiades geo444 Galleries Digital Photography Review

Please, tell me which one do you prefer ?

;)
Forum: Pentax K-5 & K-5 II 06-22-2020, 01:29 PM  
K-5 For Astrophotography
Posted By geo444
Replies: 1,118
Views: 314,753
.
Another set of 6 .PEF files I had some time to Rebuid from start...
are the 6 Exposures of 630 sec. each at ISO-80 from M-45 with the Pentax K-5
- the first version was made from 3 .PEFs only :
Pleiades M45 Pentax K5 geo444 Galleries Digital Photography Review

The fact that I erased my SD-Card between the 2 nights has resulted in Double-Crossed Stars...
I couldn't restore the Exact Camera Position on my S-W 200/1000 :lol:
= No Special Effect Filters were used !

Colors, Noise wise, the last 6 .PEFs version is far better :


.

A much larger M-45 picture, 2296 × 1528 is pixel-peepable here :
https://en.astronomike.net/1252091.jpg?20200611

... or with its Datas here :
Messier 45 - Pentax K-5 @ ISO 80 : 6 x 10 min. - SkyWatcher 200/1000 - Clusters AstronoMike.net
M45 - Pentax K5 iso 80 : 6 x 10 min - SkyWatcher 200/1000 - Clusters AstronoMike.net

... else you could also inspect it here :
Pentax K5 M45 Pleiades geo444 Galleries Digital Photography Review

Enjoy... :cool:
Forum: Pentax K-5 & K-5 II 04-21-2020, 02:29 PM  
16.3 Megapixels?
Posted By geo444
Replies: 11
Views: 7,645
.
This is the right size for a JPEG Direct file, or a JPEG got from RAW through Usual Tools...
Why ? Because some pixels are Reserved all around the RAW matrix to facilitate these Usual Tools's work
Plus Lens-Correction-Programs are certainly optimized for that Usual Size...

Now, if you open a .PEF RAW file from a K-5 in some Specialized Tools, such as DSS... RT... etc...
-> Such Tools are able to use the full matrix, because they don't need the Reserved pixels,
DeepSkyStacker uses 4950 x 3284 pixels, some Tools even use 4992 x 3344 pixels

Take a look at DxoMark's Specs comparing Pentax K-5-II vs K-5-IIs :
Pentax K-5 vs Pentax K-5 II vs Pentax K-5 IIs
the former's resolution is 4928 x 3264 vs the latter is 4992 x 3284 pixels ?
( 4992 x 3284 / 1000 / 1000 = 16.39 MPix ? )
despite both K-5-II cameras use the same Sony imx071 sensor as the 1st Pentax K-5 !

-> Indicated Resolution is usually the JPEG matrix, sometimes the RAW matrix.

-> Extra pixels are Not just Masked pixels (photoptimist's answer)

-> Sometimes Vertical Pixel Count is wrong (NX-mini) :
Maxi Astro (Ciel Profond) au NX mini...
see the Black Lines added by DSS-336 at the bottom of these M42's pictures
Maxi Astro (CP) au NX mini
in fact the Vertical Pixel Count is wrong from the file dcraw922.c
dcraw - Wikipedia
The true Vertical Pixel Count is 3688, Not 3693 pixels :
Samsung NX-mini RAW file opened in DeepSkyStacker 336
I had to hack DSS-336 to fix that problem :
Maxi Astro, M42 Orion au NX mini

Else, same for the NX-mini : JPEG matrix 5472 x 3648 ; RAW matrix by DSS 5544 x 3693

;)
Forum: Non-Pentax Cameras: Canon, Nikon, etc. 04-16-2020, 12:58 AM  
Samsung NX mini, a Top Infra-Red ILC for $125€
Posted By geo444
Replies: 11
Views: 6,149
.
Hi 2old4toys !
Thanks to you to buy one...
I sometimes feel like an Alien being alone using my ~$125€~ Selfie-Camera for Astro-Photography ! :lol:

The NX-mini challenged me seing the Results of the Canon G7X
Early 2015 : the Highest Rated Canon APS-C camera got a... 1 inch Sensor ! :eek:
that made me jump out to get a used NX-mini ASAP :
Camera Sensor Comparison Tools
.

.
The 1 inch BSI sensor is ~1/3 of the area of an APS-C sensor...
... but its Sports Score is only ~1/2 of the Eos 7D-II's !
.

.
Can't wait to see your Results

Here is the last Advantage of this little costless Selfie Camera...
it seems that its Amp-Glow is better managed by Samsung than by Zwo for its Astro-cams...
especially when looking at C.Buil's results :
www.astrosurf.com/buil/asi183mm
/!\ 180° rotated sample
.

.
Terrible Weather Conditions forced me to lower my Usual Exposure Duration from 4 min. down to 30 sec.
... so I had to push the ISO setting up to ISO-800
One can see the Amp-Glow localised to the Lower Corners of the Frame
- Ambient Temperature was at ~10~11°C
Huge Turbulence, hence the Score...
~80~90 km/h wind gusts !

But the Sky Back-Ground Lightness w/ SkyGlow filter is only reaching 4.86% ! :eek:
... this from inside a Big City at Sea-Side with Huge Light Pollution :
Astronomie et Conditions d'Astronomie
= How to Trash citizen's money in Lighting the Sky !

Finally, these 30 sec. subs were not parts of the final picture...
that was buit from the better 4 min. subs at ISO-100
the whole looong story of M-42 starts here
Maxi Astro (DSSO) au NX mini

the Full-Size 2640×1808 picture :
M42 Orion NX-mini : geo444 : Galleries : Digital Photography Review : DPReview
= 32x 4 min. at ISO-100 NX-mini at prime focus on SW 254/1200
NX-mini let you optimise M42 : 4 min. at ISO-100 !

Half-Sized picture, Right-click, View-Image, Zoom
.

.
How to remove its IR-cut filter :
http://mecastronics.free.fr/SamsungNXminiTopIR.html
.

NX-mini's new way to Astro-Photography :
an Easy M-42 T2 Mount Thread via a "C" Lens Adapter for NX-mini :
Easy M-42 T2 Mount thread via 'C' Adapter 4 NX-mini
.

Enjoy ! ;)
Forum: Pentax K-5 & K-5 II 04-15-2020, 12:11 PM  
K-5 For Astrophotography
Posted By geo444
Replies: 1,118
Views: 314,753
...
I had some time to rework these 3 old .PEFs from start to a better picture...
= the faintest stars get rid of the redish noise, completely :
.

.

A much larger M-13 version, 2304 × 1568 is pixel-peepable here :
https://en.astronomike.net/1247739.jpg?20200415

... or with its Datas here :
Messier 13 - Pentax K-5 @ iso 80 : 3 x 10 min - Proto DIMA 254/1200 - Clusters AstronoMike.net
M13 - Pentax K-5 iso 80 : 3 x 10 min - Proto. 254 / 1200 - Clusters AstronoMike.net

... else you could also pixel-peep it here :
https://www.dpreview.com/galleries/7467909648/photos/4058270/m13-hercules-pntx-k5

+ At the lower right of M-13... you can also see :
- IC- 4617 Magnitude ~15 Size ~1,1' x 0,4'
- Ngc6207 Magnitude 12 Size 3'x1,1'

Enjoy... :cool:
Forum: Pentax K-5 & K-5 II 03-11-2020, 12:12 PM  
K-5 For Astrophotography
Posted By geo444
Replies: 1,118
Views: 314,753
.
+10 ! ;)

What, 352 days since the last AstroPhotography has been posted,

I can't wait to post 3 of my first Astro-Shots taken with this Pentax Champion,

Hercule Cluster, shot 3210 days ago, K-5 at ISO 80 setting on a SkyWatcher 254/1200 :

A large M-13 version, 2208 × 1536 is pixel-peepable here :

https://en.astronomike.net/1240634.jpg?20110529
.
Forum: Non-Pentax Cameras: Canon, Nikon, etc. 11-23-2019, 04:55 AM  
Samsung NX mini, a Top Infra-Red ILC for $125€
Posted By geo444
Replies: 11
Views: 6,149
.
Ladies, Gentlemen and Moon-Maids...
... here is the Image Quality one can get with a 1" BSI sensor !

I was somewhat helped by the Atmospheric Conditions : hazy and quiet...
- but the Colors - especially the Red and Blue - suffered a little
I couldn't get the amazing colors of the page top M27

The result is so detailed that I uploaded it in ~3000 x ~2000 pixels
-> you can watch the 3000 Pixels Wide Picture here :
Maxi Astro (Ciel Profond) au NX mini...
and also there :
M27, seen as if you were close : Digital Photography Review

= 30 .SRW Stacked, then Levels Push w/ Elements.3
Right-Click + View-Image + F11 to watch...
a half-sized preview of M27
.

.
Enjoy !

New infos about NX mini's imx183 BSI sensor :
Samsung-NX-mini-TOP-Infra-Red-ILC

;)
Forum: Non-Pentax Cameras: Canon, Nikon, etc. 11-23-2019, 03:31 AM  
Nikon 1 love?
Posted By geo444
Replies: 20
Views: 1,924
Sorry Kwb, I didn't see your answer before ! :o ...Too much Astro nights ?


.
This may be difficult while keeping both Price and Size at the minimum -> see below...


.
Yes, this may be more easy to achieve with a slightly Larger Mount...


.
This is a pain for Composites / Stacking, as you never know if the Q will do the LENR or not...
After a night of Astro shots, you end up with 1/3 of yer pictures being Smoothed by the LENR ! :hmm:

100 ans de Pentax, Interview de Philippe Farreng : DG-Ventes Ricoh.EU :
Pentax fête ses 100 ans : "notre communauté est extrêmement attachée à notre marque"

Au début du dernier § : Si vous pouviez concevoir votre propre appareil photo...
Philippe Farreng : « le Meilleur Appareil Photo, c’est celui que vous avez toujours sur vous »
.

P. Farreng : « the Best Camera, is the one you carry everywhere with you ! »

... maybe the White Paper's Title for a tiny Pentax 1" BSI ILC ?
.

.
How much would you pay for this 1" BSI ILC : everyday in your Pocket
- it's just slightly bigger than the original Q... or the Q7 for a cheaper plastic version... see attached Pic
- its 01 Standard Prime Lens is a SMC Pntax 15mm f/1.8 w/ a 49mm filter thread... see attached Pic

- its 02 Standard Zoom is a SMC Pentax 9-27mm f/3.5-4.5... the 06 is a 25-75mm f/2.8-4... etc...
- IBIS & K-adapter are present as the Q family... its LCD tilts, could support an Optional EVF...

it's NOT Crippled as was the Q Family :
- No more 30 sec. limitation for the Bulb Exposure...
- No more Automatic LENR, it's also Fully Applicable / Cancelable...
- No more Lack of a Wired Remote control socket, the IR Remote works 4 Bulb Mode...
- Multi Exposure Mode outputs either .JPG or .DNG files...

High Image Quality guaranteed, even in Very Low Light conditions :
Samsung NX mini, a Top Infra-Red ILC for $125
Maxi Astro (Ciel Profond) au NX mini...

Please guys, would you add your own suggestions...
thanks ;)
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