jcolwell Online Upload & Sell: On
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Is that a ZE lens (which should work OK) or an older Contax lens ?
If it's a ZE, then there could be a glitch in the Canon/ZE exposure algorithm. IOW, since the ZE lens (and EF lens) is metered wide open, the camera calculates what the aperture/shutter speed/ISO "should be" when you push the shutter button, for the "taking aperture" that you have set in the camera. For example, if you're using a ZE 85/1.4 with the camera set for f/2.8, then the camera exposure meter is detecting illumination at f/1.4, and calculating what exposure parameters should be for the correct exposure at f/2.8. If there's a glitch in the Canon/ZE system, then the exposure will be off.
OTOH, if it's a Contax lens, then you're the guinea pig. Most of my Contax lenses work reliably with EOS Av exposure, but some don't, on some but not all EOS cameras.
P.S. since your result is underexposed, it's probably not an aperture-control issue.
Long story, short (too late), if it's a ZE lens, you should contact both CPS Canada and Zeiss Canada, because it's probably an issue in the firmware; hopefully, the in the camera firmware.
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