Question about Quantaray 28-200MM F3.8-5.6 Lens for Canon AF

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Quantaray 28-200mm Aspherical IF

Ok, so I recently purchased this lense on a whim for $100 on ebay. It sounded like it was in great shape and after reading quite a few reviews on it I thought it sounded like something I could definitly use based on the price. I'm using a Canon Rebel XT with it as well. I'm having some issues with it that I can't quite figure out and was hoping someone would have an idea or 2 for me.

The Problem: When using this lense in bright situations such as taking portrait pictures of my brother at his graduation at noon the lense seems to think it is to bright out and will somehow "dim" itself. This results in very dark pictures. In order to reset this I have to turn the camera off and disconnect the lense then put it all back together again and it is back to normal. However one shot and it goes dark again. Anybody have any ideas as to why this is happening? None of my other Cannon lenses do this. Even better yet would be a way to fix this from happening in the future.

Thanks,
Ryan

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If I read this right, your lens is a 28 to 200mm zoom lens with aperture of f:3.5 - f:5.6. What this means is that at 28mm it has a maximum aperture of f:3.5. When you zoom out to 200mm, the maximum aperture is now f:5.6. This is perfectly normal for a zoom lens of this type.

Typical situation in Shutter preferred mode. I have the shutter set at 1/125 of a second and the f:stop is f:3.5. When I zoom out to 200mm, the shutter speed is still 1/125 of a second, but the f:stop is now f:5.6 and I have decreased exposure (darkened the picture) by almost 2 full f: stops.

Realizing this, I think that "turning off the camera" really isn't a fix. The problem is realizing that the aperture will change as the focal length of the lens changes (as you ZOOM in or out on your subject). Try the aperture preferred mode and you should note that the shutter speed will change as you zoom in and out.

Most important, pay attention to shutter and f:stop info in your viewfinder. FYI : Zoom lenses that hold aperture at all ranges cost several thousand dollars, and canon makes them - they weigh a ton.

Posted on May 30, 2008

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