CARL ZEISS JENA DDR MC FLEKTOGON 2.4/35 Carl Zeiss Jena Flektogon M42 Mount Thank you for viewing. I am selling this because I don't use it often. When the lens is held up to a light and looked through, it is clean with no mold or haze. When viewed critically, faint wiping marks and coating unevenness can be seen in the light's reflection. Neither of these affect the images taken, but please refrain from purchasing if you are concerned. Focus ring rotation: It doesn't feel perfectly uniform, but it's smooth, not too heavy or too light. Infinity focus: Achieved. It was slightly over-infinity with an adapter for EOS. Aperture blades: Open and close smoothly. The automatic operation and the click feel of the aperture ring are also fine. Overall, there are few scratches, but this is an old lens of average condition, so please understand this. No claims, no returns.