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Forum: Pentax K-5 & K-5 II
02-06-2024, 01:41 PM
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Hi Allan !... How are you, Mr Cobbu2 ? ;)
2021, Nov 29 : a day to forget... the day when I lost my Home... I'm seriously missing Astro-Photography...
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Good news for us and Pentax too... It's better late than never !
---
I'm now trying to gather all the useful informations about this Pentax " King-Five " that I kept all along these years...
of shooting, discarding the worst shots, stacking the keepers and then post-processing the final images...
you who want to know why this K-5 APSc DSLR has stil such an Excellent Image Quality...
especially in High Contrast and (Very) Low Light conditions, please go there :
Pentax K5 : Best DR ILC for Long Exposures in Very Low Light
Nice Sky photographs, gifthorse :)
King-Five, guys ! :cool:
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Forum: Pentax News and Rumors
11-28-2021, 04:02 AM
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Forum: Pentax K-5 & K-5 II
11-27-2021, 11:04 PM
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Forum: Pentax K-5 & K-5 II
11-27-2021, 07:35 AM
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Forum: Pentax K-5 & K-5 II
09-12-2021, 04:21 AM
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I like the Red too ! Especially with its highlighted stars that I didn't get on the Pink one...
but, the only way to improve the Perceived Contrast is to add more Blue & Green to the Red, hence the Pink !
Many Thanks for appreciating !
I'll try to make it simple to use for everyone...
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Especially for you, a Black and White reworked version !
Thanks for your kind appreciation !
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RosetteMCCou67B&W.jpg - Right Click, View image :
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enjoy ! ;)
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Forum: Pentax K-5 & K-5 II
09-07-2021, 01:21 AM
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A successful first attempt, Bravo !
Love the inimitable rendering of the sky with the Pentax 6x7 and the Fujichrome film :
- Angel Terrace, Mammoth Hot Springs, Yellowstone & Grand Teton 4/21, yer Album.
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Hi all ! ;)
More Easy & Efficient than editing autosave.tif in L*a*b mode ?
I am now testing a new way to boost Pentax K5's performance at base ISO-80 :
- 8 RGB .PEF files stacked through DSS to a Color picture as usual
- 1/ these Raw files are exported one color plane at a time, each to a B&W .fits or .tiff file -or-
.. 2/ these Raw files are converted to B&W .fits / .tiff files (1/ to Super-Pixel 2/ to match Bilinear Color stack)
- the best B&W results from these are stacked
- result's levels are pushed to make a High Contrast B&W mask
- the Color picture and the High Contrast B&W mask are blended together in Elements, Gimp, Photoshop, etc.
- you can even try several ways to blend them together thus getting the best result to your taste...
Here is my 1st " Pink prototype picture " using this process :
it is the Rosette Nebula from 8 .PEF files, each is a ~15 minutes long exposure...
... resulting in a Second place in DPR's Challenge named "Edited.." :
Rosette, Ngc-2237 nebula, 2nd place in "Edited" Challenge of DPReview
RosetteMCCou60.jpg - Right Click, View image :
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Now let's Compare this to the original picture, a simple stack from 6 .PEF files in 2015 :
https://g3.img-dpreview.com/2364ADE4B8904B8197CD1BD7DAB375DE.jpg
... the 2 Raw files added to get the picture above are not the best !
And my 2nd " Red prototype picture " using this new process :
= the Rosette Nebula from 7 .PEF files, each is a ~15 minutes long exposure...
blended in another way w/ its High Contrast mask
RosetteMCLC50.jpg - Right Click, View image :
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Which one do you prefer, the "Pink" or the "Red Rosette" ?
the whole story of these Long Exposures of Rosette nebula since feb. 2013 :
Pentax me voila : mon K5 arrive juste, p. 8
- winter's appalling weather conditions in a well lit city at sea side...
the story of this New Process starting from the 2015 original picture w/o use of it :
Pentax K-5 : vos Photos ( fil ouvert )... page 47
Pentax me revoila : mon K-5 arrive juste, page 12
I'll post a page on my site dedicated to this process as soon as it's reliable & easy to use
Easy DiY Mod for Pentax Samsung ILC for Astro, IR Landscape
;)
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Forum: Pentax K-1 & K-1 II
04-03-2021, 12:09 PM
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@bdery, apologies for this off-topic post...
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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...
;)
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Forum: Pentax K-5 & K-5 II
12-21-2020, 12:01 AM
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Sorry, I just forgot 5 words here :
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The Closer to Base-ISO 80, the More it's True...
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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.
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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 ;)
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Forum: Pentax K-5 & K-5 II
12-18-2020, 04:20 PM
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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
;)
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Forum: Canon, Nikon, Sony, and Other Camera Brands
11-06-2020, 03:49 AM
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Good : it's the very Affordable and Reliable entry level model ! :cool:
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That is not a final problem !
Each PS Lens you'll buy later will work in Time (T) Mode
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Forum: Canon, Nikon, Sony, and Other Camera Brands
11-05-2020, 12:19 PM
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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 !
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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 :
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;)
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Forum: Canon, Nikon, Sony, and Other Camera Brands
11-05-2020, 04:03 AM
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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 ?
;)
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Forum: Canon, Nikon, Sony, and Other Camera Brands
11-04-2020, 12:03 PM
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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 !
;)
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Forum: Canon, Nikon, Sony, and Other Camera Brands
11-03-2020, 05:29 AM
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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
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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.
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F11+ Right Click + View Image :
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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 !
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How to do Astro-Photography with very little money :
Electro-Opto-Mechanical DIY to improve Pentax, Samsung cameras...
No cookies, 100% free site !
;)
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Forum: Pentax K-5 & K-5 II
11-03-2020, 04:03 AM
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Forum: Canon, Nikon, Sony, and Other Camera Brands
11-02-2020, 07:18 AM
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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 :
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Other details and sizes here :
https://www.dpreview.com/galleries/7467909648/photos/4098937/m-51-a-b-nx-mini
Enjoy ! ;)
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Forum: Pentax Q
10-06-2020, 08:05 AM
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Forum: Pentax Q
10-06-2020, 02:33 AM
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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
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Forum: General Photography
09-29-2020, 02:31 PM
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Forum: Pentax Q
09-28-2020, 01:52 PM
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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 !
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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 !
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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
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Congrats 2old4toys : #1 and #3 are Nice And Sharp !
+ isn't the #3 to show some... retro look ?
;)
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Forum: Pentax Q
09-28-2020, 12:40 PM
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Forum: Digital Processing, Software, and Printing
09-22-2020, 04:22 AM
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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
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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
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Camera Simulator, Exposure Calculator, Light Value -49 to 69 Ev.
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3 Control-Dials + 1 Lighting-Dimmer added :
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Forum: Pentax K-5 & K-5 II
07-24-2020, 01:08 AM
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Forum: Pentax K-5 & K-5 II
06-22-2020, 01:29 PM
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