Having problems with your Sigma Digital Cameras ?

Hi all, I wonder if you can supply some advice regarding a Sigma17-35mm lens I purchased earlier in the year. Basically if I use the automatic or 'P' setting on my Canon EOS 30D camera the image is over exposed by 1 to 2 stops. If I use the same functions with my Canon 18 -55 kit lens the exposure is correct so I would presume the camera is not causing the problem. The only way I can get a correct exposure with the Sigma lens is to compensate manually for each shot. Please note the exposure p


Answers :

Try your EOS in AV (aprature value) mode. You should be able to adjust your aperature value in 1/3 or 1/2 steps dependind how you have your Custom Functions set in your camera's menu. Possibly the lens you purchased is for an EOS 35mm. If you use a 35mm lens on your eos there are some calculations you must use. When using a 35mm lens on the EOS 20D, 30D, 40D and 50D bodies, you must first calculate your focal leingth by 1.6 times. With this, your exposure changes as well.
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\015\012The only EOS Digital SLR bodies that use a 35mm x 24mm CMOS sensor are the 1D and 5D. My wife uses a Tamron 18-200mm f3.5-5.6 lens on her 20D and loves it.
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\015\012If this makes no difference, you may have a defective lens.
Repair Help & Product Troubleshooting for Sigma Digital Cameras

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Hi all, I wonder if you can supply some advice regarding a Sigma17-35mm lens I purchased earlier in the year. Basically if I use the automatic or 'P' setting on my Canon EOS 30D camera the image is over exposed by 1 to 2 stops. If I use the same functions with my Canon 18 -55 kit lens the exposure is correct so I would presume the camera is not causing the problem. The only way I can get a correct exposure with the Sigma lens is to compensate manually for each shot. Please note the exposure p


Try your EOS in AV (aprature value) mode. You should be able to adjust your aperature value in 1/3 or 1/2 steps dependind how you have your Custom Functions set in your camera's menu. Possibly the lens you purchased is for an EOS 35mm. If you use a 3 ... Sigma Digital Cameras

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