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Works great on my Pentax Takumar 35mm f/3.5, and 200mm f/4. Only problem I have is my Super Multi Coated Takumar 50mm f/1.4. The inner back ring of the adapter is slightly too narrow and it grinds into and bends the aperture control switch on the rear of the lens. This will only affect the Super Multi Coated or SMC lenses, but the standard Super Takumar's will be fine. Might be due to imprecision during manufacturing.