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05-07-2016, 01:45 PM   #1
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FF mode - DA15 - crop factors & crop sizes

One interesting thing is to optimize the usage of DA lenses within the FF image circle.

Just did some crop tests with DA15 in FF mode and get better results as expected:

1 : 1 - 4500 x 4500 px
5 : 4 - 4912 x 3930 px
4 : 3 - 4912 x 3684 px
16 : 9 - 5600 x 3150 px

Maybe this is interesting for you too.

I stored the settings as styles in Capture One Pro. Now I can simply select the crop-style I'd like to use for a DA15 image. The only thing to do is to move the crop frame on the full frame image to get a position without vignetting.

For the test shot I didn't use the build in hood but an external "Lego hood":

To get "in front" of the build in lens hood rim of DA15 I used an uv filter 49mm, then step-up 49-62mm - step-up 62-82mm - metal lens hood 82mm - 105mm - looks funny. I don't know if this is necessary but it works. It doesn't clip the DA15 image circle.

05-09-2016, 01:57 AM   #2
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any samples to share? Just hope Ricoh add these crop modes in coming firmware

BTW, full size image should be 7360 X 4912?
05-09-2016, 09:45 AM   #3
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QuoteOriginally posted by yipchunyu Quote
any samples to share? Just hope Ricoh add these crop modes in coming firmware

BTW, full size image should be 7360 X 4912?
I captured my lightbox in FF mode so you can recognize the image circle of the DA15. For this capture I set the distance to infinite and aperture f4. These settings show the smallest image circle for this lens. I also added 2 frames to each image. The red one shows the APSC-frame that measures 4800 x 3200 px. The green one shows the frame with specific ratio and dimensions in px.

I really put the dimensions to the limit. The price for this is some vignetting in the corners that widely can be eliminated in post processing. To get rid of this I also think about creating LCC-profiles for a set of apertures. So it may be possible to automate the process.

What you'll also see is that you can get a wider angle of view than on APSC cameras like K-3 - very nice.

For all crops I created a Capture One style. One klick on a crop style menu item and immediately I get the centered crop I wished - just perfect IMO.




FF 7360x4912 DA15 4500x4500px


FF 7360x4912 DA15 5x4 4912x3930px


FF 7360x4912 DA15 4x3 4912x3684px


FF 7360x4912 DA15 16x9 5600x3150px



FF 7360x4912 DA15 2x1 5600x2800px



05-09-2016, 12:14 PM - 3 Likes   #4
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Crop modes in action ...
  • capture: FF mode, HD DA15, iso1000, f11, 1/50, DNG
  • raw processing: Capture One Pro
  • no work on vignetting
  • scaled down to 600px width



FF 7360x4912 DA15 uncropped - 36,15 MP


FF 7360x4912 DA15 1:1 4500x4500px - 20,25 MP


FF 7360x4912 DA15 5:4 4912x3930px - 19,30 MP


FF 7360x4912 DA15 4:3 4912x3684px - 18,10 MP


FF 7360x4912 DA15 3:2 4800x3200 APSC-crop - 15,36 MP


FF 7360x4912 DA15 16:9 5600x3150px - 17,64 MP


FF 7360x4912 DA15 2:1 5600x2800px - 15,68 MP




Please let me know if these infos were kind of helpful for someone - thanks in advance!



Last edited by acoufap; 05-09-2016 at 12:48 PM. Reason: image references corrected, megapixel added
05-09-2016, 05:09 PM   #5
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Should we expected to see some images on your post?
05-09-2016, 05:41 PM   #6
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QuoteOriginally posted by yipchunyu Quote
Should we expected to see some images on your post?
I see images. They are located on pentaxforums.com server, so they should be globally visible.

The URL looks like this for the last flower image:
Code:
https://www.pentaxforums.com/forums/members/34716-acoufap/albums/9062-technic/picture99184.jpg
05-09-2016, 05:52 PM   #7
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Thx. Saw the images now
The image size will be smaller than the one from k3ii, right?

Last edited by yipchunyu; 05-10-2016 at 05:44 AM.
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