Question

 Canon 40D error 01 message appears when lens is set to 17 to 24mm.?

Answer I'm not 100% certain but it's likely an issue with your lens rather than the 40D body. Try connecting a different lens to see whether the same communication error appears.Aside from the obvious cl... Read More »
http://answers.yahoo.com//question/index?qid=20090710225000AAx6F07

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http://answers.yahoo.com/question/index?qid=20130414001225AAVm1Jm

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