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40D, Manual Mode, Problem Adj. Aperture


casey_ferguson

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Casey,

Older Sigma lenses work with Canon bodies only at max. aperture. Some however, can be rechipped by Sigma and - AFAIK - they will be happy to do it for you.

Please specify what type of Sigma lens you are using and I try to check what you can/cannot do with it.

(a few years ago I received a compatibility chart from the local Sigma dealer)

Good luck, Istvan

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"It is a sigma lens. I have not tried any canon lenses. "

 

Oh my... Only recent vintage Sigmas will work on Canon's latest. I used to have to upgrade

my Sigma ROM chips every year when I bought a new body. Eventually Sigma stopped

supporting my Sigma models and I had to toss them. All were of mid-to late 90s vintage and

in 2001, they really weren't very old.

Sometimes the light’s all shining on me. Other times I can barely see.

- Robert Hunter

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