Rol_Lei Nut
Member
thanks for all your input. what is a ai converted lens? is this worth wile or something i should avoid?
i think my 50mm is an Ai, how can i tell definitively? also, i don't think my fm10 used the Ai-s functions, so the extra money isn't worth it in my case. unless someone can tell me otherwise.
again, thanks for all the advice, it gives me much to think about and decide on.
In some cases an AI converted lens is optically the same (apart from the coating), just a piece has been ground off the aperture ring (or the ring itself has been replaced) to allow full aperture metering on later cameras.
Often, though, the AI/AIS versions are optically upgraded and are preferable (with a few specialist exceptions - the 55mm Micro for close-up work, for example).
The 200mm f/4.0 and older 105mm f/2.5 (at some pre-AI point they changed the formulation), just to name two, are much better in AI/AIS versions.