SMC PENTAX -AF 645 1:2.8 75mm Lens A used lens is in a very good condition. Focus and aperture works fine but manually ONLY!!!For a few years we used this lens on an Ultra High Speed 35mm Photo-Sonic camera for table top slow motion photography around 1000FPS mostly. Everything came out sharp and clear.In order to modify it for our use in slow motion, and as we needed the aperture always to be wide open, we canceled the option for automatic-electronic aperture.Lens S/N 4866747 This lens works properly but only with manual aperture!!!!The AE was taken off on purpose when we used it for table top shooting on a special motion pictures camera Photo-Sonics 4B/CThat is the reason we lower the price, otherwise everything works great.