Need advice: SD15 back-focusing

Started Mar 24, 2012 | Discussions thread
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PrebenR Veteran Member • Posts: 3,529
Need advice: SD15 back-focusing


I noticed that my SD15 didn't focus well with my lenses. I called the retailer and said it seems to be backfocusing. They then just wanted I send in the lenses. But if all lenses are backfocusing on the SD15, then isn't it more likely that it is the SD15 that is the problem? I'm currently testing the lenses, but so far I can verify that my 20-40mm EX f2.8 and 50mm EX f1.4 are backfocusing. If I manual focus I get fine results. I have not had time to test well my 70-200mm f2.8 and 17-70mm lenses yet, so I cannot conclude yet that they all focus wrongly. I took some snapshots though and they seems to be back-focusing.

So my question is, should I send in everything or insist they check the camera first?

I can also test them on my SD14, but the AF on that is somewhat dodgy too.

Autofocus test 20-40mm. Focus on the sign

Manual focus 20-40mm. Focus on the sign

Autofocus test 50mm. Focus on the hand

Manual focus 50mm. Focus on the hand

If you zoom in you can see that the text is much clearer when manual focusing...

So doesn't this indicate that the camera is wrong?

Sigma SD14 Sigma SD15
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