AF Microadjust for 100-400mm lens

Started Mar 22, 2017 | Discussions thread
Zeee Forum Pro • Posts: 16,375
Re: AF Microadjust for 100-400mm lens

JoshuaT wrote:

Thank you Zeee for the link to FoCal which explains the recommended minimum test distance. This makes a lot more sense than the rule of 50X times of the focal length. Also Dustin Abbott has an instructive YouTube video on microadjustment using FoCal software.

Thanks for the videos. I'm convinced Canon picked 50X as a random number to cover themselves and reduce tech support calls. They know at 50X people will be well beyond the point where a lens settles.

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