I was very cautious at first because I thought there was contact between the rear lens and the shutter on my M9. Actually no, it wasn't. When I took some test photos and looked at them on the LCD screen, I thought they were too dark. What I saw were raw (dng) files. After processing raw images in DXO, it was like magic. This lens is incredible. This opens up a whole new way of seeing. If you decide not to buy a 10mm viewfinder that attaches to your camera's hot shoe, don't be discouraged. Justβ¦