scott kirkpatrick
Well-known member
Here's what is going on with "design for digital" including the final software correction in the total lens design. Capture One 11.1 (the standard edition) shows the example image this way, shown in the lens profile page with the crop tool selected in the top line:
Screen Shot 2018-05-05 at 7.11.32 AM (2) by scott kirkpatrick, on Flickr
Very wide angle lenses, left to their own devices, will have barrel distortion, pulling in extra stuff in the corners. Optical correction of the corners leaves you with mustache distortion, which is worse. So today's designers pass the barrel image through for software to fix. In the screenshot, I have unchecked "hide the distorted area," and left distortion correction at 100%, so I see the scene that the lens has actually captured. The black area is the result of trimming this actual, but extrapolated image back to 6000x4000 pixels. If there is something interesting at the edges, I can push the crop lines out quite a bit. Here is the upper left quarter of the image, with distortion fully corrected (click through to Flickr to see it bigger):
L1120264_SL601_RMR_May_2018 by
scott kirkpatrick, on Flickr
Since the reconstructed image was extrapolated, creating each new pixel out of several raw pixels, some like to turn off the distortion correction, and just use the raw image. Here's what that looks like:
L1120264_SL601_RMR_May_2018 1 by scott kirkpatrick, on Flickr
Not a very good idea for bricks or architecture, but it adds a little extra crispness to foliage or rocks.
Screen Shot 2018-05-05 at 7.11.32 AM (2) by scott kirkpatrick, on Flickr
Very wide angle lenses, left to their own devices, will have barrel distortion, pulling in extra stuff in the corners. Optical correction of the corners leaves you with mustache distortion, which is worse. So today's designers pass the barrel image through for software to fix. In the screenshot, I have unchecked "hide the distorted area," and left distortion correction at 100%, so I see the scene that the lens has actually captured. The black area is the result of trimming this actual, but extrapolated image back to 6000x4000 pixels. If there is something interesting at the edges, I can push the crop lines out quite a bit. Here is the upper left quarter of the image, with distortion fully corrected (click through to Flickr to see it bigger):
L1120264_SL601_RMR_May_2018 by
scott kirkpatrick, on Flickr
Since the reconstructed image was extrapolated, creating each new pixel out of several raw pixels, some like to turn off the distortion correction, and just use the raw image. Here's what that looks like:
L1120264_SL601_RMR_May_2018 1 by scott kirkpatrick, on Flickr
Not a very good idea for bricks or architecture, but it adds a little extra crispness to foliage or rocks.