Strange front-focusing problem with Sigma 35/1.4

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badlydrawnboy
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p.5 #1 · Strange front-focusing problem with Sigma 35/1.4

Not necessarily. The MA was done with the center focus point. Most of the AF problems I've had involved real-world shooting using non-center AF points. The Canon rep I spoke with said it's in theory possible that the outer AF points aren't functioning properly.

Jan 06, 2013 at 02:08 AM

mttran
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p.5 #2 · Strange front-focusing problem with Sigma 35/1.4

badlydrawnboy wrote:
Not necessarily. The MA was done with the center focus point. Most of the AF problems I've had involved real-world shooting using non-center AF points. The Canon rep I spoke with said it's in theory possible that the outer AF points aren't functioning properly.

Fast lenses stopping down effects has screwed up your outter AF calculation as discussed here: http://www.fredmiranda.com/forum/topic/1179122/5#11247175

Jan 06, 2013 at 10:35 PM

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