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| p.19 #8 · Dot-Tune: Autofocus Fine Tuning in under 5 minutes |
Hi Can anyone suggest please?
I got a Zeiss manual focus lens for my 5D mark III, and after using the DotTune method, the first steady point is +16 toward the + side, after using the slightly defocus method to workaround, i found the Steady green dot range is 14, so the mid point is 7 and that brings the exact point to be at +16 plus 7 = +23 which is out of the AFMA range.
what shall I do in this case? should I set at +16 or +20 or send the lens back to manufacture to calibrate within the...Show more →
your writeup is a bit confusing, how did you figure the range is 14 for this manual focus Zeiss? Are you basing it off of other 50mm at the same distance? ANyway, +20 is closer to +23 which would be better than your +16 focus edge. BUT, being that the Zeiss is positioned to work on the Canon with AF confirm, I would suggest sending back to them to better calibrate and tell them that it is naturally and heavily front focusing.
ALSO - one related piece of advice. In Canon AF systems, even for fixed focal length and distance to subject, you will get differenet MFA values under different types of lighting!!! Flourescent will create back focused results while Incandescent will be front focued, and Sunlight in between. ;-(. So, if you sent to Zeiss, consider including description of lighting.