Question about Canon EOS-20D Digital Camera with 17-85mm Lens
Some case this type of error is in connection of incompatible lenses. I had same problem with a Sigma DL 70-300/4-5.6. It's working only in Av position (Aperture priority) and every time I need to set the minimum aperture and it's work. If you forget renewing the aperture setting quickly drop in the ERR99 message because this machine can't control the aperture settings. Very esasy to check any type of lens. Set to Av pos and set a big value in (e.g. 16) and push the depth ctrl button under the lens release button and look into the lens and you need to see that the aperture moving. (I hope anybody understand me, sorry my english isn't perfect yet)
Posted on Nov 17, 2007
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