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Author Topic: Question about Canon 50mm 1.4 AF and AFMA  (Read 1803 times)

Dave_NYC

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Question about Canon 50mm 1.4 AF and AFMA
« on: April 19, 2013, 02:19:34 PM »
I am trying out a Canon 50mm 1.4 after having substantial problems with a shifting depth of field on a Sigma 50mm (which I loved in every other respect, it was definitely sharper than this canon in the 1.4 - 2.0 range.).

Trouble is, I'm seeing something with the Canon as well. Basically, if I am within about 8 feet from the focus subject, I get relatively good AF accuracy (allowing for some fluctuation).  But the second I hit 10 feet or so, I have to push AFMA to -10 or pretty much every shot is OOF.

Is this to be expected, or did I just get a bum copy? Would appreciate any input here, my return window is closing next week, if I need to get it exchanged or outright returned.

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Question about Canon 50mm 1.4 AF and AFMA
« on: April 19, 2013, 02:19:34 PM »

Sporgon

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Re: Question about Canon 50mm 1.4 AF and AFMA
« Reply #1 on: April 19, 2013, 02:44:37 PM »
There seem to be hundreds of EF 50 f1.4 out there that are actually broken inside - mine included. They still work - in a fashion. There is some plastic part involved in the focus which is ludicrously fragile.

If you have picked yours up used this could be the problem. If it's new, I doubt it.

Random Orbits

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Re: Question about Canon 50mm 1.4 AF and AFMA
« Reply #2 on: April 19, 2013, 03:26:33 PM »
If the problems persist at f/2.8 or smaller, exchange it.  The copy I evaluated was soft wide open to about f/2.8.  After that, it was sharp.

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Re: Question about Canon 50mm 1.4 AF and AFMA
« Reply #3 on: April 19, 2013, 03:40:00 PM »
Return both.  Its normal for Sigma to have AF issues, but something sounds damaged on the Canon lens.
 

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Re: Question about Canon 50mm 1.4 AF and AFMA
« Reply #3 on: April 19, 2013, 03:40:00 PM »