Hawkeye 64mp LensPosition doesn't follow 1/r law

Hello,

for my application I need to set the focus of the camera to a specific distance without AF. This should be possible by setting the LensPosition to 1/r where r is the distance from subject to camera in meters. For 10cm this works more or less fine, but when introducing distances like 25cm it doesn’t follow the law at all.
If I set the LensPosition to 4 in this case, the subject is completely out of focus. I can only go back into focus once I set it around 7.3 or so. This seems to me like a pretty big deviation. Do you know what might cause this or what I can do? :slight_smile: