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Photography Question 

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Is it my lens, my camera, or me?


 
 
Greetings!

I've started having a wierd problem with my Canon 10D and Sigma 28-200 lens.
When shooting outside in bright daylight I've been getting what I thought were random exposure problems. It seemed that a few frames of the same subject were grossly overexposed to the point of being unusable. All the other frames were extremely good exposures.

I took over 100 frames of a marching band today and had the same problem. When I look at the image data, however, (thank you digital!) I find that the frames which are overexposed are all between the focal length of 40mm and 70mm. The exact same subjects under the exact same conditions are exposed properly at focal lengths wider than 40mm and more telephoto than 70mm.
Coincidence? Could be. But I can't find a wide or telephoto image that's bad and I can't find a medium focal-length image that's good.
Focal length doesn't seem to be a problem when using flash.
Is it possible for the lens to be messing up the exposure? Could the camera THINK the exposure was right, but the lens is staying wide-open? Why would flash work, then?

Thanks in advance for your help!

Art


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September 12, 2004

 
- Gregory LaGrange

BetterPhoto Member
Contact Gregory LaGrange
Gregory LaGrange's Gallery 		  very well could be a communication problem with lens and camera. that's the problem that made to fit brands have sometimes.
The picture at 9.5 went down in shutter speed instead of up.
If you send the lens back to sigma, if that's the problem, they're supposed to fix it for.


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September 12, 2004

 
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