Comparing focus test methods

Started Jan 26, 2013 | Discussions thread
R2D2 Forum Pro • Posts: 16,944
Re: Comparing focus test methods

Kevin C Ross wrote:

I would need larger targets to test at greater distances.

Sorry to see your lenses are off.  I had a 50 f1.8 that front focused, but was able to MFA it with my 50D.  Have since parted with it.  All of my current lenses are spot-on with my T4i fortunately (can't conduct any of WilbaW's tests at the moment tho).  Thanks for giving it the ol' college try.

Note: Just flip your cereal box around and you're good to go at normal shooting distances (ie 50x focal length).  Go to for some good AF data analysis too.


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