Hi everyone, Today I just purchased a Mecablitz 48-af. When I use it with my Nikon F100, everything is OK (with Tamron AF XR Di cpu lens). But, when I switch to Nikon FM3a, the TTL flash just don't work (with the same Tamron lens). The manual mode is OK for both camera. The display lcd on the flash is cannot provide the same information as when I used my Nikon F100 (with the same basic TTL flash "only" mode, not the matrix mode of F100). On Nikon F100 basic TTL mode, the flash lcd provide aperture info, distance, and zoom position. But on Nikon FM3a basic TTL mode, only display the zoom position (28mm, 35mm), the aperture and distance range is not displayed. And no error message on the lcd display of the flash gun. Can it be because my Nikon FM3a is not compatible with the Tamron cpu lens? Or both of the lens and flash is not compatible? or all of the three it is not compatible? I'll try to purchase the nikon lens with cpu for the test. Have anybody experience this kind of things? Can the cpu lens uncompatible with the flash gun? Thank you.