Please be kind, I'm new :blushing: I thought I had this figured out but am now more confused than ever, please help. I recently purchased a Samsung NX300. I picked up an adapter to use my old 35mm lenses on it. I thought I understood the 35mm to APS-c conversion, my understanding was multiply the focal length of the APS-c lens by the crop factor of ~1.5 to get the equivalent 35mm focal length. When using an old vivitar 100-300mm @ 200mm, I got the same picture as when using the samsung @ 200mm. So does the adapter eliminate the crop factor? If so, what is the use of a 35mm rating?