AFMA – Easy or Not

[TrumpetPower!]

I have found only a small difference in AFMA between wide and zoom for most of my lenses.

It's also worth noting that the difference you found is small enough that it's well within the margin of error. That is, on any given shot, the AF system itself is going to vary by at least +/- 1, which is the difference you list for your lenses.

Personally, with your findings, if I could only have one adjustment (rather than the two you get with modern bodies and zooms), I'd split the figures and forget about it.

That's a great thing about FoCal -- it plots the results. And you can plainly see that pretty much any number in that plateau area is going to produce the same real-world results -- and that sweating over neighboring values in the middle of the sweet spot is an exercise in futility.

Cheers,

b&

 

[RGF]

Actually I read that Canon delayed the release to insure the it's manufacturing was dialled in properly.

Canon is doing something differently now versus 10 years ago. Remember eye control, DO, EOS 1N RS, ...

All one offs or never made it into the main stream. Seems that Canon had been for years sell prototype technologies to see if they ever caught on.

Ever since Canon got burnt by the bad AF on the 1D M3 they seem to be spending more time to make sure things are more solid. Also they have upped their prices so I suspect they feel the need to deliver more value.

 

[digital paradise]

According to DotTune, my 24-70 2.8 II is spot on at 0!

I've checked all my lenses and all are quite acceptable. Don't understand why others have so much trouble!

Maybe my standards are lower??

Z

Mine was - 1@ 24 and +1 @ 70. Maybe I should send it in

 

[Sella174]

I never knew my EF 50mm f/1.4 USM lens front-focused, until the chap I sold it to showed me ... he was shooting "portraits" at f/1.4 ... I always used it at f/8~11.