MakerBot Print is our newest print-prepration software, which supports native CAD files and STL assemblies,
allows you to interact with all your printers via the Cloud, and many other exciting new features.

Download Now

Report as inappropriate

Hi Steve
I'm pretty sure that you are correct. I don't have the specific numbers handy, but the difference between the center and the corners/edges is at least a couple of stops. The distance from the pinhole to the edge is farther than to the center of the frame. Ergo, the f-number for the corner is correspondingly bigger than that for the center. f/135 is a compromise between the difference.