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Old 27th May 2008, 09:37 AM   #1 (permalink)
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Default Sigma 28-70mm f/2.8 auto-focus problem

Hmm.. Noticed a weird issue with the Sigma 28-70mm f/2.8 lens. The D300's 51-point auto-focus doesn't work all the time with it. Even with high-contrast objects, it sometimes fails to focus.

When it fails to work, it just refuses to work, no matter where you point the lens at. Even if you change to a different object, it still refuses to auto-detect the focus.

Point focus works better but unlike other lenses, it has trouble with lower-contrast objects...

I wonder if it's a lens problem, or merely a characteristic of this lens. This is not the newer EX DG model .
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Old 27th May 2008, 11:46 PM   #2 (permalink)
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Default

It refuses to detect, or the lens refuses to even try to focus?
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Old 28th May 2008, 10:07 AM   #3 (permalink)
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Quote:
Originally Posted by Chai View Post
It refuses to detect, or the lens refuses to even try to focus?
Umm.. Well, when I half-press the shutter button, nothing happens. The AF light is continuously on.

Sometimes the lens attempts to focus... on other occasions, the lens does nothing.
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Old 29th May 2008, 07:44 AM   #4 (permalink)
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Motor driven lens? Any other lens with similar problem?
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Old 29th May 2008, 10:09 AM   #5 (permalink)
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Possibly an 'incompatible' issue with the lens focusing chip? Hmm can test on my D300 and see if it's the same.
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Old 29th May 2008, 01:08 PM   #6 (permalink)
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Quote:
Originally Posted by Chai View Post
Motor driven lens? Any other lens with similar problem?
The thing is it happens randomly, usually when I really need to take a quick shot. Hahaha...

I have another 28-70mm. I will give that a try later.
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Old 29th May 2008, 01:09 PM   #7 (permalink)
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Quote:
Originally Posted by peaz View Post
Possibly an 'incompatible' issue with the lens focusing chip? Hmm can test on my D300 and see if it's the same.
Yeah, should try on another D300. When are you free?
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Old 29th May 2008, 01:47 PM   #8 (permalink)
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Yeah maybe it's a Sigma lens compatibility problem. Never get Sigma lenses...
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Old 29th May 2008, 02:07 PM   #9 (permalink)
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Quote:
Originally Posted by Chai View Post
Yeah maybe it's a Sigma lens compatibility problem. Never get Sigma lenses...
LOL!! You did!
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Old 29th May 2008, 05:19 PM   #10 (permalink)
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Sorry, I meant to say old Sigma lenses...
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