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07-17-2018, 11:54 AM - 1 Like   #1
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Latest CameraVille Video on K-1 Mark II

Here is the video:


He points out the purple color when you boost ISO 100. Which Ian Normal also saw in his ISO Invariance test.

07-17-2018, 01:58 PM   #2
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Thanks for posting. While saying "its no good", is definitely putting it too strong, he does point out interesting points in his review (and with a good deal of humour!).

I must admit though, sometimes I like to push the dynamic range a bit (one of the reasons I have a K-1) and so those results would be a bit bothersome.

Last edited by kiwi_jono; 07-17-2018 at 02:46 PM.
07-17-2018, 02:56 PM   #3
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I have never had any ISO difficulty with my K-1 II. I use reasonable ISO settings and the images are excellent.

Shortcut to example image below:

https://www.pentaxforums.com/gallery/images/52508/1_IMGP3254_Crop.jpg

Last edited by C_Jones; 07-17-2018 at 03:07 PM.
07-18-2018, 03:02 AM   #4
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QuoteOriginally posted by SirTomster Quote
Here is the video:

Pentax K1 MKII + Lightroom Update - YouTube

He points out the purple color when you boost ISO 100. Which Ian Normal also saw in his ISO Invariance test.
I think that has to be a raw converter issue. I have seen nothing like that when I boost iso 100 images.

I have posted an iso 100 shot here, first one as shot, second one pushed four and a half stops and I just don't see purple color with K-1 II shots, even when pushed. They behave the same as K-1 shots from what I can tell.

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PENTAX K-1 Mark II  Photo 
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PENTAX K-1 Mark II  Photo 
07-18-2018, 03:40 AM   #5
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I have seen the purple thing few times now. It has been related to long exposures in all cases. Happens with both LR and RawTherapee and exact triggering mechanism currently unknown.
07-18-2018, 06:07 AM   #6
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QuoteOriginally posted by Rondec Quote
I think that has to be a raw converter issue. I have seen nothing like that when I boost iso 100 images.

I have posted an iso 100 shot here, first one as shot, second one pushed four and a half stops and I just don't see purple color with K-1 II shots, even when pushed. They behave the same as K-1 shots from what I can tell.
His purples are in the blacks when pushed, I don't see any blacks on your pushed image, except in the trees and the wood piles, but without zooming in I can't see if there are purples or not.
07-18-2018, 12:05 PM - 1 Like   #7
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I find that his ways of conducting these tests aren't very scientific. His images look like the focus is placed differently, hence why some things are more blurred than others. Likewise, he starts out saying that no single update alone has ever created magic to fix something, which again isn't the case here.

Someone stated that Capture One doesn't produce purple when pushing the exposure. Can someone verify this?
07-18-2018, 12:48 PM   #8
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It's like his K-1 mk II with SIlkypix video where he conclude hand-held pixel shift is no different than a regular RAW and thus doesn't work.

Was he using Silkypix or Digital Camera Utility. DCU 5.8 ships with the mk II and was quickly updated to 5.81. However, neither version supports hand-held pixel shift.

So how was he comparing a standard RAW vs a HHPS RAW? Was he comparing the preview JPEG in the RAW files viewed in "Silkypix" or was he comparing JPEGs that were processed with "Silkypix". Since nothing including DCU and Silkypix supported HHPS at the time of the review developing would only use the first frame. So there is no wonder that they are the same!

As of yet, I don't think anything other than the out-of-camera JPEGs support HHPS.

04-04-2020, 05:13 PM   #9
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QuoteOriginally posted by CNunez Quote
I find that his ways of conducting these tests aren't very scientific. His images look like the focus is placed differently, hence why some things are more blurred than others. Likewise, he starts out saying that no single update alone has ever created magic to fix something, which again isn't the case here.

Someone stated that Capture One doesn't produce purple when pushing the exposure. Can someone verify this?
CNunez, yes. See below

Let's sort out this "dynamic range of K1 Mark II being crappy and giving purple" issue once and for all (or do our best at least). This is inspired by Cameraville's multiple Lightroom-edited reviews of the underexposed Mark II images, where he was very disappointed with its purple blacks


We need to get away from this idea of RAW files being baked because, in my eyes, sometimes it seems they're cooked to near-enough perfectio in the Mark II. I'm shooting at ISO 6400 without an ounce of worry - with my K1 I really wouldn't have done this past ISO 3200, and even that would be a bit of a hesitation.

Cameraville is an awesome channel but he does not do enough to scrutinise the things he is doing. First of all, Lightroom is a pile of poo when it comes to Pentax support. I love everything about it, except camera support. Capture One and Affinity Photo do a much better job (though it took Capture One a good few years to even entertain the Pentax brand )

He also needs to address the simpler but crucial things such as why is it really that the purple artefacts switch from the K! to Mark II as he zooms out? He says in the comments it's due to his PC loading these huge files but this is, I'm afraid, plain wrong. It's actually down to the compressed preview of what you're working on and how this is then processed into a JPEG. If you zoom right in to a test shot of a Mark II after bringing up the exposure by 4 or 5 stops (whatever you underexposed by) then you'll see that upon very close inspection the artefacts disappear in Lightroom, but zoom out a little (say 1:2) and they come back. This is especially apparent once colour noise reduction has been applied above a value of 1. Even with smoothness pushed to 100 it's still there, yet once again disappears on zooming in. When you go to develop a 100% quality large JPEG, the artefacts are there. When you go to develop a TIF, sometimes they're actually gone. Even freakier, when you adjust the tint the artefacts shift very randomly and, at times, either take over the whole photo or completely disappear.


In short, Lightroom needs to sort themselves out! Also, please let's not discuss the dynamic range "test" on DPReview of the K1 Mark II. The K1 photos use a 77mm FA Ltd and the K1 Mark II a DFA 24-70mm. But it's not so much about the lenses as it is about the lighting and that the scene is ever so slightly different. Just look at the champagne bottle reflections and the missing peacock feather on the top-right


Anyways, to prove to you guys how incredible the Mark II truly is I have made a +4EV adjustments profile for Capture One. Just use this as a "style" within the software. If you need help with this just let me know and I'll walk you through it. Honestly I have never seen such incredible image recovery at a 4-stop push. Well, maybe from a D810 but then the noise is equal to that of K1 whereas the Mark II does incredibly with noise.


Another thing I've wanted to mention is this idea of sacrificing fine details for ISO in the Mark II. We have to remember that any attempt to match the noise level in the K1 to that of a comparable K1 Mark II shot would mean a loss in fine details also - in some cases more severely than what Mark II achieves in-camera. Remember that RAW files are just numbers for the software to interpret. Factory-set processing carried out in camera is one of the most accurate ways of messing with those RAW files rather than relying on a bit of software that tries to cater for an entire industry.


So the Capture One "Style" (this is similar to what would be called a "preset" in Lightroom) is there to give you those deep blacks and eliminate any purple and magenta, without sacrificing those hues in any other non-shadow or non-black part of your image. I've not included any white balance changes since that's obviously best left for you to manually manage.

Let me just finalise this by saying that I bet by now you probably think "oh, here we go. Somebody who bought into the Mark II or got a K1 upgraded and is now reaching for sour grapes." Well, nothing could be further from the truth. I actually almost replaced my Mark II with a K1 when I saw those Cameraville videos a few months ago. However I decided to do my own testing and realised there's a lot more than meets the eye - quite literally. Also the AF of the Mark II is so much nicer for BIF and sports. Love it to bits


My attachment is here (first message as OP): K1 Mark II Dynamic Range - Purple and/or Magenta Artefacts

Enjoy

I can also make a similar preset for Affinity Photo if anybody is interested.

Last edited by DaveSimo; 04-04-2020 at 05:31 PM.
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