Sigma lens

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In article <1or6r3dpo63197ucn5cu5d3alq9smflvv1 RemoveThis @4ax.com>, <me RemoveThis @mine.net>
wrote:

> What Canon body? I believe the con/prosumer bodies won't AF if the max
> aperture is smaller than f/5.6. so where ever this lens (28-300mm F3.5-6.3
> DG Macro) is smaller than f/5.6 in it's zoom range it might not focus.

it reports f/5.6 to the camera so that the autofocus continues to work.
however, since it really is f/6.3, it may still have trouble.
 >> Stay informed about: Sigma lens 

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In article <aos6r3l0rvgrlpfml1cpt8slk2hkr9jqd8.TakeThisOut@4ax.com>, <me.TakeThisOut@mine.net>
wrote:

> >it reports f/5.6 to the camera so that the autofocus continues to work.
> >however, since it really is f/6.3, it may still have trouble.
>
> So it's then possible to have an incorrect aperture in the exif info as
> well? What a POS.

i don't know if that affects the exif data or not. it might just say
that f/5.6 is the maximum and still report the correct aperture when
the photo is taken (which would be set on the camera).
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"3Putt from CoastalSouth Carolina" <3putt@PawleysIslandSC> wrote in message
news:47b36c66$0$1080$4c368faf@roadrunner.com...
> Received a Sigma DG lens from a large mail-order house today, and shot off
> 75 photos at various focal lengths. The photos inside 10' were sharp.
> Photos shot at 200mm-300mm were mostly out of focus using a tripod or hand
> held. At those distances the lens seemed not to find a focus point, even
> though I was using center point focusing. The mail-order house agreed to
> replace the lens or refund the $$, but with a 15% restocking fee. I opted
> for a replacement. I am hoping this is not a common problem with this
> lens (Sigma 28-300mm DG), as I have had good success kit lenses (75-300mm
> III) with Canon.

http://www.ephotozine.com/article/Sigma-28-300mm-f35-63-DG-Macro

Not so good on the long end.
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The writer does not say if the lens can be manually focused or if the
problem occurs in bright sunlight. If it can be manually focused the problem
is likely due to not enough light reaching the autofocus sensor because of
the maximum aperture being too small.
I had two Nikon 55-200s that could not find focus regardless of focal length
or lighting conditions, hence all Nikon lenses are sh*t? Well that
particular one is and one of the worst lenses I have ever seen regardless of
manufacturer.
The 28-200/300 category, as a whole, regardless of manufacturer (including
Nikon) are not very good designs anyway.
The digital only 18-200s are much better performers as a whole, including
the insanely overpriced Nikon 18-200 (call me crazy, I own one) but should
not be confused with high grade optics.
 >> Stay informed about: Sigma lens 

In article <47b36c66$0$1080$4c368faf@roadrunner.com>, 3Putt from
CoastalSouth Carolina <3putt@PawleysIslandSC> wrote:

> Received a Sigma DG lens from a large mail-order house today, and shot off
> 75 photos at various focal lengths. The photos inside 10' were sharp.
> Photos shot at 200mm-300mm were mostly out of focus using a tripod or hand
> held. At those distances the lens seemed not to find a focus point, even
> though I was using center point focusing. The mail-order house agreed to
> replace the lens or refund the $$, but with a 15% restocking fee. I opted
> for a replacement. I am hoping this is not a common problem with this lens
> (Sigma 28-300mm DG), as I have had good success kit lenses (75-300mm III)
> with Canon.

Bend over, grab your ankles, and get the OEM. Sigma markets to amateurs
who are too cheap to buy OEM.
 >> Stay informed about: Sigma lens