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90D and Canon 300mm f4 L IS USM inconsistencies in exposure

Wandalynn
Enthusiast

I wanted to see if (1) anyone else has had this problem and (2) if there are any fixes. First, let me say that my Canon 300mm lens has worked perfectly on my 70D, my 6Dii, and my R cameras. Add to that that all of my other Canon lenses perform perfectly with the 90D. I almost exclusively shoot in AV mode, mostly nature closeups, and mostly use evaluative metering, sometimes spot.  Taking pictures with the 90D + 300 through the VF, almost all of them are severely underexposed, almost black. Taking pictures with same lens using Live View, the exposure is fine. Again, that never happens with my other lenses on this camera, and I have no problems with this lens on my other cameras. Input appreciated.

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