Sigma 50mm f/1.4 AF issues - Fixable?

[Sheiky]

I would like to bring the lens in to Sigma some time this summer when I get some free time. Until then, I have e-mailed Sigma support on my issue and am awaiting a reply. I'll keep you informed.

That would be great!

I went thru 3 copies

I only tried 1 copy and am absolutely happy with it, the quote from John(neuroanatomist) makes me wonder if I should take the chance to let Sigma calibrate it just so my girlfriend can use it on her camera. Perhaps it won't handle so well for me after that [:P]...hmm...

I recently upgraded to a 7D

Are you sure you've got all your settings right? Try putting off the extra sensitive focus crosspoints. Just remain with the main center focus point without any expansion of that point. That will give you the most reliable results, given that f1.4 is really really sensitive with that tiny DOF.



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Seems like thecomments by Roger at lensrentals.commight be relevant:

Do you think I should get my Sigma checked? I mean is it worth the chance? Given that it works perfect on my camera, just the 450D of my girlfriend wont accept it without some front-focussing which can't be calibrated.


Thanks guys,


Jan
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[neuroanatomist]

Do you think I should get my Sigma checked? I mean is it worth the chance? Given that it works perfect on my camera, just the 450D of my girlfriend wont accept it without some front-focussing which can't be calibrated.

Depends on your generosity. "If it ain't broke, don't fix it." But, since the 450D doesn't do AF microadjustment, it probably just means you'd need to re-adjust for your camera once you got it back.

[Sheiky]

Depends on your generosity. "If it ain't broke, don't fix it." But, since the 450D doesn't do AF microadjustment, it probably just means you'd need to re-adjust for your camera once you got it back.

That's exactly my problem...it ain't broken at all. Except no-one else can enjoy my lens. I don't mind to re-adjust my camera again, I'm just worried that the lens will function differently afterwards (instead of reliable inaccuracy). Hmm I'll sleep a few night over it since I don't really want to lose my lens for like 3 weeks or so...

[JohnGoose]

In the long run, I guess it doesn't matter too much at all. I really like the lens and won't be selling it. I will most likely bring my lens in to Sigma and see what they can do.


To be honest, I may be over scrutinizing. I'm not normally a pixel peeper. I never really pulled out my other Canon lenses and tested their AF capabilities and varying focal lengths. I just heard of this problem with the 50 1.4 and decided to probe further. I'm sure a lot of the OOF shots I've taken can just as easily bedesignatedasuser error. But Ido expect my equipment tofunction optimally. After all, we paid enough for it, right?

[Sheiky]

You're right John. I'm also very happy with it and to be honest my Canon 100mm macro also front-focuses quite a bit in portrait distances. But for the macro work where it's designed for it shines! So I'm not complaining [H]