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Author Topic: AF "issue" with Macro 100mm f2.8L on 7D but on 5D3  (Read 1048 times)

TriGGy

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AF "issue" with Macro 100mm f2.8L on 7D but on 5D3
« on: October 27, 2012, 07:51:25 PM »
I just noticed that when using a 100mm Macro f2.8L on my 7D, if I start the focusing either from zero or infinity, it seems that AF is impossible with my 7D (it tries to AF but to no avail). My workaround is to turn the focus ring to approximate the focus on my subject, I press the shutter button halfway and the AF locks on. I don't have to start from zero or infinity - I would just make the scene totally out of focus, the 7D cannot autofocus all the way.

With the 5D mk3, the lens focuses as it should (searching for the right focus and then locks on the subject) even if I start from zero or infinity.

I don't know if this is how the lens works for the type of body it is on (FF or APS-C). Has anyone here have a 7D and a 100mm macro f2.8L and experienced the same thing (or differently)? Is there an explanation for this phenomenon?

I am loving this lens on the 5D3. With the 7D I will just add another step when focusing - if this is normal.

Thanks!
« Last Edit: October 27, 2012, 07:56:13 PM by TriGGy »

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AF "issue" with Macro 100mm f2.8L on 7D but on 5D3
« on: October 27, 2012, 07:51:25 PM »

TriGGy

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Re: AF "issue" with Macro 100mm f2.8L on 7D but on 5D3
« Reply #1 on: October 27, 2012, 08:02:41 PM »
Oh I spoke too soon - I just found the fix.

I just needed to set the Autofocus/Drive (C. Fn III) in the menu to set the "lens drive when AF is impossible" to 0:Focus search on.

Sorry for the additional thread.

 ;D

sandymandy

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Re: AF "issue" with Macro 100mm f2.8L on 7D but on 5D3
« Reply #2 on: October 29, 2012, 08:55:31 AM »
Good u posted the solution! It might help other people with the same problem. Nothing is worse when people write on a forum only "Ok fixed it bye"  ::)

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Re: AF "issue" with Macro 100mm f2.8L on 7D but on 5D3
« Reply #2 on: October 29, 2012, 08:55:31 AM »