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Trying to mfa my 5DIII and 400 mm do with FoCal. Photos at 50x focal length with large test target appear to be in focus to the naked eye with zero mfa. However, I had to mfa the 400mm lens on my 5D II with Focal and it did help at +6. I am trying to see what mfa, if any, it needs on the 5D III.
I am using FoCal plus and despite several scenarios outside in decent light, Focal cannot complete. I am using a tripod, geared ball head, and target is attached to a wall. FoCal notes inconsistencies with lens/camera and cannot nail a recommended mfa after 50 shots. I did some manual shots with a cable release. I can see at -10 and +10 performance is worse than 0 mfa. In between this, results are hard to parse.
I recall mfa changes to be more dramatic when using the 5D II and the 400mm do.
Any suggestions on how to confirm my mfa setting?