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05-28-2016, 11:45 AM   #16
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QuoteOriginally posted by Franc Quote
so any idea what the delay timewise is?
One way to find this out is to photograph a target moving at a known speed. Roughly, the time interval between each of the 4 shots is approximately 0.2 seconds, so just a bit faster than the max FPS.

---------- Post added 28-05-16 at 20:48 ----------

QuoteOriginally posted by quh86 Quote
thats incorrect. 4 x 1/250 = 4/250 = 1/(250/4) ~1/60
:-) I guess what Franc meant is to have a total shutter speed of 1/250th for 4 composite shots, therefore 1/1000th for each of the 4 composite shots.

05-28-2016, 11:49 AM   #17
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I did pixel shift experiments with the moon. Shutter speed was 1/90th sec and all 4 frames were taken perfectly. On a tripod, of course.
05-28-2016, 11:49 AM   #18
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-- I think trying to get more resolution with pixel shift on a K1 crop, there is a better solution: using a K3 instead.
05-28-2016, 12:42 PM   #19
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QuoteOriginally posted by Franc Quote
so any idea what the delay timewise is?
Not sure, but it is likely at least as fast as the normal K-1 burst speed, which I think is ~ 4 fps, so ~ 1 sec. to capture all 4 exposures. It should be faster since PS uses electronic shutter and the mirror doesn't have to cycle between frames in PS. This thread https://www.pentaxforums.com/forums/172-pentax-k-3/317686-i-need-clarity-how-...ift-works.html may be helpful.

05-28-2016, 11:10 PM   #20
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QuoteOriginally posted by biz-engineer Quote
-- I think trying to get more resolution with pixel shift on a K1 crop, there is a better solution: using a K3 instead.
that's possible, but the idea was to get the bird pixel shifted on a K1 FF. The photo's are more detailed with the FF then using the K3 as i hardly have any cropping to do. I'm curious what the result would be using pixel shift.
05-28-2016, 11:36 PM   #21
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QuoteOriginally posted by Franc Quote
that's possible, but the idea was to get the bird pixel shifted on a K1 FF. The photo's are more detailed with the FF then using the K3 as i hardly have any cropping to do. I'm curious what the result would be using pixel shift.
:-) if you don't need to crop, then great. For pixel shift, you can try multiple instances of pixel shift to try to get one good lucky shot.
05-29-2016, 11:52 AM   #22
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I just checked with the author of dcrawps as to what process he uses during motion detection and repair. It is pretty simple: Since the green pixels are in the same place only in image 1 and image 3 during the pixel shift process, he simply analyzes the green level between these two images dependent on how much % change you asked for on the command line, and if the change exceeds this value, replaces the changed pixels in image 3 with those from image 1. I would not be surprised if that is how DCU does it as well.
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