02-20-2017 04:31 AM
Hi guys, has anybody tested in how far the lenses aperture takes effect to the scanning quality /
how sensitive are the results in regards aperture (DOF)? Is there a aperture you roughly recommend?
02-20-2017 01:26 PM
Try to scan at the optimal aperture (often found in lens reviews).
Low f-stop and you have lens aberration, too high and you have light bouncing on the blades of the diaphragm.
On DSLR, I usually stay between 11 and 16.
Each lens has it's sweet spot.
Since we are scanning, the higher the f-stop the better until your image quality drops.
All the above is unrelated to David. I don't know if something else comes into play.
02-21-2017 01:07 AM
Thank you, this is in between the settings i use anyway.
But i havent found lens reviews for the industrial c-mount / cs-mount lenses. Do you have a source?
02-21-2017 01:15 AM
I don't have a specific site with lens reviews for industrial camera lenses.
I would download this chart:
Print and take pictures with your camera and different f/stops.
You will quickly find the usuable range for you lens.
02-22-2017 05:43 AM
Small aperture setting also introduce distortion from diffraction around the blades, I try not to use an aperture smaller than f11, F16 max. Use an ND filter if you need to stop down the image.