Sigma 10-22mm softness/blurring problems

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fatboybrando - 09 Mar 2006 13:29 GMT

Just been on to Sigma UK and they say the fault may be with the flange
in my EOS 350D...anyone else experienced this problem with a 350D?

Cheers

(Hi folks

I've been using the sigma 10-20mm f/4-5.6 EX DC HSM lens on my Canon
350D and noticed some softness/blurring on the right hand side of images.

Has anyone else experienced this and is it a common issue with these
lenses or have I been unlucky in buying a 'Friday afternoon' lens?

Cheers)

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tomm42 - 09 Mar 2006 13:46 GMT

> Just been on to Sigma UK and they say the fault may be with the flange
> in my EOS 350D...anyone else experienced this problem with a 350D?
[quoted text clipped - 10 lines]
>
> Cheers)

Photograph a brick wall with your regular lens, have it fill the frame
at a mid range if you are using a zoom. Shoot with the aperture wide
open. Check to see if the focus is even accross the field of view. I
would suspect your mount would have to be seriously bent to see the
problem you are describing with a wide angle, and should be worse with
your regular lens again if the mount is bent.
The one time a studio I worked for bought a Sigma lens we returned the
first two they gave us because of poor image quality, the third one was
excellent though.
Do this test to prove it is the lens, if it ends up being you camera it
is an expensive repair.
Good luck
Tom

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Paul Murray - 09 Mar 2006 13:49 GMT

> I've been using the sigma 10-20mm f/4-5.6 EX DC HSM lens on my Canon
> 350D and noticed some softness/blurring on the right hand side of images.

Could be a centering problem.
From the Photozone.de test of this lens:

"It is worth to mention that we tested two samples of this lens. One had a
slight centering problem at 10mm..."

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Randall Ainsworth - 09 Mar 2006 14:34 GMT

> Just been on to Sigma UK and they say the fault may be with the flange
> in my EOS 350D...anyone else experienced this problem with a 350D?

Of course it wouldn't be a crappy Sigma product causing the problem.

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JPS@no.komm - 09 Mar 2006 21:55 GMT

>> Just been on to Sigma UK and they say the fault may be with the flange
>> in my EOS 350D...anyone else experienced this problem with a 350D?

>Of course it wouldn't be a crappy Sigma product causing the problem.

Could be ... just like it could be a crappy Canon product causing the
problem, if it were a Canon lens. Like all those soft $6K 600mm f/4L
lenses that went back to Canon several times before they were fixed a
few years ago.

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Lionel - 09 Mar 2006 23:34 GMT

>>> Just been on to Sigma UK and they say the fault may be with the flange
>>> in my EOS 350D...anyone else experienced this problem with a 350D?
[quoted text clipped - 5 lines]
>lenses that went back to Canon several times before they were fixed a
>few years ago.

That's certainly a possibility, but if I had to bet on the outcome, I
wouldn't have a lot of trouble deciding where to put my money.

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