Author Topic: Hands on the Pentax K1 and Pixel-Shift  (Read 4683 times)

Michael Erlewine

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Hands on the Pentax K1 and Pixel-Shift
« on: June 02, 2016, 18:50:20 »
Here is a quick report on the new Pentax K1 in the actual work situations I find myself in. There is good news and bad news... for me. The bad news is that it looks like I have to learn (and put up) with another camera. Part of it is that I am used to my Nikons and all of that. The other part is that, IMO, the Pentax K1 interface as not as easy to use or as well-designed as Nikon.

I would send it back just to spare myself the aggravation but for the very nice results. At this point, I am just checking it out a little bit, and trying to get over holding my nose while I am at it.

The color with the Pentax is crisper, brighter, more natural (almost too contrasty!) compared to the overall muddier look of my Nikon D810, now that I see them side by side. Ouch!

I don’t have a ton of lenses for the K1 and the Pentax (so far anyway) is much less tolerant of odd lenses than are my Nikons bodies. If everything is equal, which it is not, then the Pentax is... doable IMO.

The Pentax pixel-shift files are huge, and a real pain for my computer, not to mention their storage requirements  (~ 150K each). The LCD screen on the back of the camera is very adjustable, but I won’t be using it because I have my Zacuto Z-Finder magnifier on the back for fine focus, and it is needed. This camera is very fussy with focus.

On the plus side,  the K1 has a fairly easy-to-use LiveView magnifier that goes up to something like 16x, which is more than I need or makes sense.

The pixel-shift files take a long time to write out and you get no warning if you decide to call it a day and yank the card before the little light goes out. Don’t do it!

You can stack focus with these files, but at the price of degradation of the files... a little bit. For my work, the Pentax K1 will probably be used to take single shots photos at high f/Stops like f/12-16. Yes, there is some diffraction, but I seem to get away with much smaller f/stops in pixel-shift mode with the K1 than on my Nikon D810.

So, the bottom line is Uggh for learning a new camera, and one not as elegant as the D810. There are other considerations as well.

Stacking K1 images, like all stacking, messes with the color and the contrast to a degree. With the K1, the pristine color is the main attraction. So far, it seems it would be better to take one-shot photos with the K1 in pixel-shift than to try and stack them. Oh yes, they stack of course, but the added contrasts, etc. may look good from a distance, but up close it looks worse than a single-shot photo, not the anyone but a pixel-peeper could tell. All stacks do, but the more pristine possibilities of the K1 in pixel-shift mode make me want to think twice before stacking. What I might want to do is combine stacked layers in Photoshop by simply copying over certain areas, instead of running the layers through the stacking software, thus avoiding the added contrast and color muddiness that stacking brings. Just a thought.

Also, right now I have only a few Voigtlander lenses that have Pentax mounts. I have an adapter to Nikon and tried on the Otus 55mm and it works, etc. However, I look forward to mounting the Pentax K1 on a bellows unit and using lenses like El Nikkor 105mm APO lenses on the front standard.

In short, I just have my toe in the water. Part of me wishes my Nikons could do pixel-shift, because their cameras would be a lot easier for me to use, since I already know them. But the bleeding edge never sleeps and new equipment drives me on.

I am interested to see Sony’s upgrade for the A7rII and Nikons upgrade of the D810 whenever they come. Meanwhile the purity of color of the pixel-shift with the K1 and the overall result is worth checking out IMO.

Photos taken with the Pentax K1, Voigtlander 90mm APO.

I have included stacked images at f/9 and f/16 and one layer not-stacked, if that helps. This is all new, but the results are better than I can get with Bayer interpolation. The pain of progress... learning all this.

Thanks to Lloyd Chambers for doing a lot of research on this camera in his columns.
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Andrea B.

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Re: Hands on the Pentax K1 and Pixel-Shift
« Reply #1 on: June 02, 2016, 19:07:44 »
Oh this looks wonderful indeed! Thank you for the initial report.

I really do NOT need another camera, but I'm not sure how I will resist this K1 with pixel shift. Also, I have lots of old M42 lenses which adapt perfectly to Pentax K. (I had a converted Pentax K5 for UV work.)

Observation - perhaps the K1 does not quite have the dynamic range of the 810. So you see a bit more blowout?
Also maybe the contrast could be dialed back prior to stacking?

Question:  did you profile the K1 colour? Or use canned profiles? I would be interested to know how the CC Passport looks SOOC and then after profiling.

Added:  I think I like the f/9 stack best for its slightly softer background. The composition is good & strong, but the background can intrude a bit in the f/16 version.

Michael Erlewine

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Re: Hands on the Pentax K1 and Pixel-Shift
« Reply #2 on: June 02, 2016, 19:39:10 »
Oh this looks wonderful indeed! Thank you for the initial report.

I really do NOT need another camera, but I'm not sure how I will resist this K1 with pixel shift. Also, I have lots of old M42 lenses which adapt perfectly to Pentax K. (I had a converted Pentax K5 for UV work.)

Observation - perhaps the K1 does not quite have the dynamic range of the 810. So you see a bit more blowout?
Also maybe the contrast could be dialed back prior to stacking?

Question:  did you profile the K1 colour? Or use canned profiles? I would be interested to know how the CC Passport looks SOOC and then after profiling.

Added:  I think I like the f/9 stack best for its slightly softer background. The composition is good & strong, but the background can intrude a bit in the f/16 version.

Much to be done. I am just getting started. Not many answers yet, but we shall see.
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Michael Erlewine

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Re: Hands on the Pentax K1 and Pixel-Shift
« Reply #3 on: June 02, 2016, 19:50:11 »
Pentax K1, CV-90mm APO, Zerene Stacker
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Frank Fremerey

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Re: Hands on the Pentax K1 and Pixel-Shift
« Reply #4 on: June 03, 2016, 13:15:57 »
I certainly love the pixel shift clarity of the first poppy. Wow! Also the arrangement of flowers is very appealing.
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Erik Lund

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Re: Hands on the Pentax K1 and Pixel-Shift
« Reply #5 on: June 03, 2016, 14:11:33 »
I also note blown out highs and a strange looking back ground but yes crisp images.
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Andrea B.

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Re: Hands on the Pentax K1 and Pixel-Shift
« Reply #6 on: June 03, 2016, 16:23:51 »
An interesting thing I note about these stacks is that while all the detail has been captured (and captured beautifully), I seem to prefer the slightly downsized versions over the larger ones. That is I like the (approximately) 750 x 1000 px appearance over the 1500 x 1000 px version (seen when clicked up with View Image).

This probably has to something to do with the perception of either "sharpness" or local contrast? It also has something to do with viewing distance.  ;)

Well, as we have noted in the past, sharpness is a somewhat elusive quality to define, but in this case I think I am referring not to detail, but to edge accutance combined with local contrasts. OK....so none of that is all that important to the overall Bonk from viewing the photo - that "hit" which occurs when we see something we are taken with for whatever reason. But I do find it of interest (personally of course, ymmv) to try to technically think through what I am seeing and to try give words to the eye's impression.

Small question:  I have forgotten - from my past reading of your stacking writing - whether stacking darkens the photo? If so, then is that something which can be controlled in the stacking software? Could you, for example, choose to create a high key style of stack?

Michael Erlewine

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Re: Hands on the Pentax K1 and Pixel-Shift
« Reply #7 on: June 03, 2016, 18:22:35 »
Here is the new Pentax K1 at work. It has the Voigtlander 90mm APO lens on it, earlier version.
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BW

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Re: Hands on the Pentax K1 and Pixel-Shift
« Reply #8 on: June 03, 2016, 21:58:03 »
Looks like an elaborate setup, but it certainly give some nice results :)