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Forum: Pentax K-1 & K-1 II
09-16-2018, 03:34 AM
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100% crops yes. Here is ISO400 crop from few weeks ago:
Absolutely beautiful rendition of night sky. All kinds of stars, bright and faint ones rendered like they should be. This kind of exposure will render smooth, clear, star trails. I will look at my archives for D3x frames, it is now 10 year old device.
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Forum: Pentax K-1 & K-1 II
09-16-2018, 03:13 AM
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I took some star trail stacks yesterday and exposed one frame @ ISO1600, 4 minutes. Here is crop from the frame with NR-module disabled in Lightroom:
DO NOT use higher than ISO400 when exposing the night sky. "Underexpose" @ ISO400 and push in post. Star trail stacks will look worse than 10 year old DSLR cameras if you go over the filtering limit. If stacked to full circle, filtered frames assemble into thick streaked low-definition rings. Also shown is Sony 36MP chroma noise which is there like with all Sony 36MP cameras when used at high ISO. Accelerator does not remove it but will blur it which also removes clear edges from faint point light sources.
Here is crop from ISO800, 30 second frame:
Now you see where those blurred streaks come from. After the filtering does not recognize high enough contrast difference, faint stars will be almost eaten out. This is worse than Sony-issue which completely loses some 1-pixel sized stars. Instead, we get smeared blobs all over.
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Forum: Pentax K-1 & K-1 II
05-14-2018, 07:51 AM
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I said cloning photoshop UI could lead to legal problems.
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Forum: Pentax K-1 & K-1 II
05-13-2018, 04:56 AM
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It could clone photoshop UI as it contains mostly the same features. But it could lead to massive legal problems.
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Forum: Pentax K-1 & K-1 II
05-13-2018, 04:28 AM
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Gimp is powerful but has weird and confusing UI. Ferrari engine in Fiat 600 frame.
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Forum: Pentax K-1 & K-1 II
05-13-2018, 04:10 AM
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You can get LR6 standalone license which is not subbed. Locally they sell for 40-50€ or so. Ofc, then you have to use DNG or modify PEF EXIF as it works with MK1 RAW files.
Then there is one workaround for photoshop :] Get "old" cs5 license for few bucks. It works with most modern plugins and scripts still AND you can do 95% of all possible hacks and edits if you are okay with the traditional UI. Or CS2 for free and run it with virtual machine. Dunno if it is free now, it was freebie for a moment years ago.
Sorry, print should work still after sub. More info here: http://blogs.adobe.com/lightroomjournal/2014/07/what-happens-to-lightroom-after-my-membership-ends.html
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Forum: Pentax K-1 & K-1 II
05-13-2018, 03:50 AM
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Your photos are not hostage. It is common mistake to think they are borked once sub ends. Develop module and printing just stops working. Your archives and photos stay intact.
One of the best methods to ruin your new hobby is to start with wrong tools. For it kills your creativity and understanding what you can do in post phase. Right tools work with any source material.
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Forum: Pentax K-1 & K-1 II
05-13-2018, 12:24 AM
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Practical limit of Sony 36MP was about 3200 ISO no matter what brand and it has not changed. ISO 12800 is usable for web-sized image at best.
Learning curve of photoshop is much lower than one might think. It is not expensive anymore thanks to CC subscription model and has all the tools one will need to handle all kinds of situations. Simple things are simple in the UI nowadays. About every common problem has a tutorial as a video as well.
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Forum: Pentax K-1 & K-1 II
05-12-2018, 08:27 AM
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You can do similar thing right now with Nik Raw Presharpener. It does not reduce noise but insteads skips it depending on your settings. The filter is VERY slow as plain photoshop plugin and takes huge amount of time to complete with typical 60-80 MP 4x5 scan I use it for these days. Works very very well when tuned for the image at hand.
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Forum: Pentax K-1 & K-1 II
05-12-2018, 08:04 AM
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There is nothing wrong in boosting -3EV ISO100 to make it look like ISO800 and show that ISO100 not only keeps all detail but effectively replaces the need for artificial software gain in-camera.
It is free workaround for anyone looking for a way to skip forced processing right now. In similar fashion I would use max ISO400 to shoot milkyway etc. astro stuff and push in post.
-3EV is nothing but standard push. I can do it with film and digital right now (even witha canon). -8EV is something and still doable by this old 36MP warhorse. Either by using PS or multiexposure.
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Forum: Pentax K-1 & K-1 II
05-12-2018, 07:16 AM
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Even a little bit of lens slop will throw away focus point when the setup receives a minor bumb. That 50mm you used felt like a plastic wonder when I tried it briefly in 2016 when purchasing the mk1.
Nothing really wrong with your idea though. It was interesting, different point of view from my own test scenario. My case in point was that by having subjects close to each other but not exactly one after another the filter logic fails to find what should be passed thru and what should be filtered. If you observe my PS example carefully you see areas of fur with sharp outer edges but in the middle devoid of all detail.
I think the accelerator looks for clear edges in the image and if it does not find them then the area receives NR filtering. It may be possible to fine tune the triggering level. By no means this is ordinary global NR function but precise local filtering with possible edge enhancement. Very slow to implement on desktop post processing software with traditional CPU.
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Forum: Pentax K-1 & K-1 II
05-12-2018, 05:04 AM
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1 and 4 are hard to get right. They have different focal point, or setup has moved, and used lens produces only blur at that aperture (like the DPR mess review). 2 & 3 are easier thanks to PS. What PS does it heavily enhances definition for focus point and almost renders a sharp zone. And when upscaled to standard large print size filtered image has no proper definition around the focus point - faint edges have faded away.
I would be interested to see the new 50/1.4 in action here.
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Forum: Pentax K-1 & K-1 II
05-12-2018, 01:56 AM
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@madbrain
It would help if your setup was consistent. Now the focus point and camera setup has moved back, forth and sideways and no photo is sharp at any point. And there are quite a lot jpg artifacts all around.
I list what I see as follows:
1. ISO 500 normal exposure
2. ISO 500 pixel shift
3. ISO 800 pixel shift
4. ISO 800 normal exposure
In any case I recommend getting a proper lens and sturdy tripod. They may help more than any other setting ever available.
If for some reason I arranged the files wrong on my end here is a package with numbered and named images: https://drive.google.com/file/d/16D4LDFiDP_kSh3GEyyNwUZG68i94j_2y/view?usp=sharing |
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Forum: Pentax K-1 & K-1 II
05-11-2018, 12:47 PM
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@stevebrot
Issue with PSR which might be affected by electronic shutter as well. But no matter, the way I see this is like:
Have a look at the topmost two waveforms - (one cycle) sine and square (copyright free image from wikipedia). Without accelerator small changes in sharpness work like sine wave (imagine peak as sharp details and bottom as pure blur) whereas with accelerator this smooth change from sharp to blur happens like 1 or 0 - the square pattern. Then have a look at the crop I just posted - the fur suddenly vanishes to totally melted blur instead of smooth analog curve. Test subject is again sheep fur blanket like earlier. Feel free to examine the RAW file.
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Forum: Pentax K-1 & K-1 II
05-11-2018, 12:28 PM
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Nowhere, you have misunderstood the nature of this phenomenon.
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Forum: Pentax K-1 & K-1 II
05-11-2018, 11:21 AM
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That is just something which WORKED very very good with mk1. I did not expect something like that.
BTW, that electronic shutter "sony" bug. It also happens with Nikon D810. Sony sensor...like in K-1.
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Forum: Pentax K-1 & K-1 II
05-11-2018, 10:53 AM
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Forum: Pentax K-1 & K-1 II
05-11-2018, 10:24 AM
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It is not voodoo. There was long discussion about this on FM-forums Sony Zeiss 50/1.4 FE thread when initial buyers got the lens. First note was that it has harsh bokeh but no. It was only after disabling fully electronic shutter that users got smooth results.
---------- Post added 05-11-18 at 10:31 AM ----------
Here is a crop of PEF PS file. This is absolutely horrible result:
Now look at it...sharp details are sharp but everything else has melted down to smooth uniform areas. This is much worse than a single exposure. ISO800, f/5.6, Samyang 35/1.4
Here is the PEF (modified EXIF so it opens with current lightroom / any other software able to open mk-1 PS files)
https://drive.google.com/file/d/1Zcvy57IOREeuC83Uki2mCIyQDcIhlcL0/view?usp=sharing |
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Forum: Pentax K-1 & K-1 II
05-11-2018, 05:50 AM
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Forum: Pentax K-1 & K-1 II
05-11-2018, 05:31 AM
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I have no idea how to use Raw Therapee effectively, when I open PS RAW, DNG or PEF it says Pixel-Shift and I can export it which works, but to get maximum details out of it I dunno what settings works best with it. I only tried the EXIF modification with PEF files, not with DNG. But, it seems to have the same camera model tag so change it to "Pentax K-1" and maybe then LR works with pixel shift as well.
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Forum: Pentax K-1 & K-1 II
05-11-2018, 04:42 AM
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I meant that the same filtering which is discussed in this thread is present in all of the 4 exposures which are included in the PS file. Current Lightroom does not officially support MK2 yet and if you open Pixel Shifted DNG RAW it does not use those 4 exposures to render final PS image but instead takes the 1st exposure which is normal exposure taken with fully electronic shutter. It shows the same noise reduction "issues" or whatever you want to call them starting from ISO640 and up.
If you use Exiftool to change camera model to "Pentax K-1" Lightroom recognizes the PEF files and lets you import them and use them as they would be normal MK1-files. This way you can use Pixel Shift in Lightroom without Adobe's official support.
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Forum: Pentax K-1 & K-1 II
05-11-2018, 03:25 AM
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It has its uses. ISO3200 gave super clean output with PS with MK1. I first thought it was not a good idea but then tried it only to find out that resulting file has about ISO200-400 worth of DR compared to normal exposure. I used ISO400 - ISO3200 in PS mode many times when shooting my skeleton series in very dim light at nighttime in the basement of old castle ruins.
PS could also be used in astrophotos with tracking mount I GUESS. And for fun, try shooting star trails stack with PS exposures :D Resulting circle has very wild colors.
@madbrain: Raw Therapee or LR when used with hacked exifdata to open PEF files. You can also use DNG and open with LR in which case it opens the first exposure in the PS file where you can see NR being done.
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Forum: Pentax K-1 & K-1 II
05-11-2018, 12:35 AM
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I meant tripod PS. It makes the end result worse :(
It uses fully electronic shutter which has effect on bokeh (makes it harsh) and every single frame still has this NR. Now, end result is amplify damage. Vector art.
---------- Post added 05-11-18 at 12:59 AM ----------
And this folks, is how it is done: Learning-to-See-in-the-Dark/README.md at master · cchen156/Learning-to-See-in-the-Dark · GitHub
Pure AI power. Now waiting for some brand to implement such, in the future (requires massive computation), and give an *option* to enable it.
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Forum: Pentax K-1 & K-1 II
05-10-2018, 01:42 PM
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Allright...a little homework for mk2 owners: go and expose pixel-shift image @ ISO800. Study the results carefully. Use RAW, not ooc-jpg. Results are quite surprising...
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Forum: Pentax K-1 & K-1 II
05-10-2018, 04:09 AM
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You can use 100% crop as final image with Foveon and properly executed PS as long as you focus it correctly. It still looks good when printed or seen on monitor. Not so with Bayer-files, small details having certain coloration becomes random mess.
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