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07-18-2018, 08:45 PM - 6 Likes   #1
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Mark I vs Mark II ISO Comparison Plus Files

I am not sure if this has been beaten to death enough or not. But for those who want the K-1 for Nightscape or Astrophotography here is some files to play with.

I finally was able to get out to some dark skies and do some comparisons between the K-1 and the K-1 Mark II. I was at a Bortle 1 location for 5 nights but had clouds all 5 nights. This was a Bortle 2 location I believe.

I created an ISO Invariance chart for both cameras.

Shot with a Rokinon 14mm f/2.8

20 second images
ISO's shown
I shot all the ISO ranges on one camera, then switched bodies. Same lens for both.
Saved as PEF files
Imported into Lightroom.
I only adjusted the Exposure to equalize to ISO 3200. ISO 100 has +5, 200 +4, etc. ISO 6400 -1EV, etc.
The images are taken from the center of my shots.

Original files linked below.

Here is the Pentax K-1




Here is the Pentax K-1 Mark II





I figured I would provide the files taken from both cameras and let the experts here play with them. I want to do some comparisons of the ISO 3200 between both cameras to compare noise reduction to detail reduction. But I know there are waaaay smarter people here that can do it better.

Google Drive Link

07-18-2018, 09:57 PM   #2
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Hi SirTomster,

An excellent job very precise, congratulations I have downloaded them to visualize them better.
07-18-2018, 11:21 PM   #3
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No much difference , I would say, except that the +5ev at iso100 turns out magenta with the K1 Mk II, and much less color drift with the K1 in the same condition.
07-18-2018, 11:34 PM   #4
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Good work - thanks for making the effort - I'm sure it will be very useful for those wavering about an upgrade and not sure what to make of all that's been said.

07-19-2018, 12:06 AM   #5
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QuoteOriginally posted by biz-engineer Quote
No much difference , I would say, except that the +5ev at iso100 turns out magenta with the K1 Mk II, and much less color drift with the K1 in the same condition.
I thought the magenta shift at ISO 100 was due to a faulty Adobe profile? Admittedly I have not followed the mk II threads too closely so I might well be wrong.
07-19-2018, 02:43 AM   #6
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Thank you very much! Really interesting for me since I'm traveling to La Palma in a few weeks and wanted to try astrotracer on my K1. I wasn't quite sure about which settings would be best and after looking at your results, it seems like there is not much of a difference between the shots. It actually looks like ISO800 is best on K1. Have to analyze this further at home.

I'm also really interested in your conclusion on this matter

QuoteOriginally posted by savoche Quote
I thought the magenta shift at ISO 100 was due to a faulty Adobe profile? Admittedly I have not followed the mk II threads too closely so I might well be wrong.
AFAIK thats correct. Did read that also somewhere on the forum.
07-19-2018, 03:39 AM   #7
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Which profile is the faulty one? The default profile which for example is applied in the current LR when opening MK2 RAW files?
07-19-2018, 03:46 AM   #8
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QuoteOriginally posted by MJKoski Quote
Which profile is the faulty one? The default profile which for example is applied in the current LR when opening MK2 RAW files?
I don't know, but I believe I read somewhere that the magenta cast disappeared when applying the K-1 profile instead of the K-1 II. Or maybe it was when converting the raw files with a non-Adobe converter. Can't really remember, sorry.

07-19-2018, 04:13 AM - 1 Like   #9
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QuoteOriginally posted by savoche Quote
I don't know, but I believe I read somewhere that the magenta cast disappeared when applying the K-1 profile instead of the K-1 II. Or maybe it was when converting the raw files with a non-Adobe converter. Can't really remember, sorry.
I think the trick was to edit the EXIF data to pretend it was shoot using a MK1.

EDIT: Found it: https://www.pentaxforums.com/forums/190-pentax-k-1/368040-lonely-speck-revie...ml#post4308965
07-19-2018, 05:12 AM   #10
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I'm seeing some magenta shift with RawTherapee, too. Weird.
07-19-2018, 05:29 AM   #11
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Yes it is there. I have some files which are shot with bulb timer (~about 5min) which have the cast and cannot be pushed even 1 stop before it shows up. It might be issue with incorrect black levels in RAW converter. Such as this issue: Pink cast in Nikon D810 14-bit raw files Issue #2814 Beep6581/RawTherapee GitHub
07-19-2018, 06:18 AM - 1 Like   #12
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QuoteOriginally posted by Kunzite Quote
I'm seeing some magenta shift with RawTherapee, too. Weird.
I thought I saw some there too. I did a quick check this morning before leaving for work and it did look magenta to me. But did not have time to compare much.

I would be curious if editing the exif would fix it as was posted above. I will have to check that later tonight when i get back home. But maybe someone will beat me to it.
07-19-2018, 08:51 AM   #13
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Thanks for posting this and the raw files.
For some reason, I can't get m version of LR to open what I think are the K-1 mk2 files (image numbers 526-530). I just updated LR, so I thought it would now recognize the files. Any hints as to what I should be doing?
07-19-2018, 09:11 AM   #14
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Only the subscription version of Lightroom will open the files. 7.4 is the current version. Standalone series stopped to Version 6.x with support for Mk1 only.
07-19-2018, 09:51 AM   #15
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QuoteOriginally posted by MJKoski Quote
Only the subscription version of Lightroom will open the files. 7.4 is the current version. Standalone series stopped to Version 6.x with support for Mk1 only.
Hmm. I have LR Classic CC. Which I do pay for via subscription, but apparently may not be as up to date as LR CC. Mine only shows v7.1.
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