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  1. Ok, I'm going nuts to get to the bottom of this, so here we are. I have this weird shadow* that appears on both short sides of the frame (even if in this picture is more evident on the left side), with the exact same weird shape, and with several kinds of adapters but ONLY with long lenses (the Contax 100-300 @ 200 and up and the Leica 180). *I don't want to call it "vignette" because it doesn't look like one, it looks more like a piece of transparent foil was in the way; please keep in mind that to make it this visible I cranked contrast and clarity, otherwise it is a problem only with the sky in that portion of the frame Every other lens is fine, with the same adapters. I've tried flocking the inside of the adapters, using different kinds, I even cleaned the sensor in the off chance it was some sort of halo on it that was causing this, but I'm still getting the "shadow". Any idea of what the hell might it be? My (wild) guesses are: a - that the camera lens mount itself might be a tad too small, and it interacts in some way with the parallel light rays projected by the long legacy lenses (I know, it's far fetched but I'm at a loss for more reasonable explanations). b - that the sensor is reflecting back a ton of light, and this interacts in some way with the back of the adapter and the mount of the legacy lens
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