Sigma 10-20 F4-5.6 focusing on 450D

Started Apr 8, 2012 | Discussions thread
role_of_72
New MemberPosts: 18Gear list
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Re: Sigma 10-20 F4-5.6 focusing on 450D
In reply to plantdoc, Apr 26, 2012

Hi Greg, thanks for the reply!

I just got back the lens from the service. The error was caused by a strange kind of front focusing which increased with subject distance. It means that on 50cm it had only 2cm front focus but on 10m it focused to 1-2m..!

Because of the varying degree of the error software correction couldn't help.

(The service screwed up it anyway: their focus tuning program had frozen and the lens didn't recognized any camera body anymore!)

This was their fault and that's why they offered a main electronics change in the lens for free, of course. With the new main panel now focusing is perfect at any distance and at any focal length.

So if anybody has the same issue (varying degree of front focusing changing with subject distance) only software calibration cannot solve the problem.

Thank you, guys for the great help! Happily this case is closed.

Bye!

 role_of_72's gear list:role_of_72's gear list
Canon EOS 450D Canon EF-S 55-250mm f/4-5.6 IS Sigma 10-20mm F4-5.6 EX DC HSM Canon EF-S 18-55mm f/3.5-5.6 IS
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