Over the years I have accumulated a number of manual focus lenses from Olympus, Nikon, Minolta, Zeiss, Canon among others. All of these lenses have been tested (read used) on APS-C and M4/3 cameras with good results for most of them. Those lenses that didn't pass the test on those cameras have no chance of passing on a full frame camera for the simple reason that the sensor uses the sweet spot of ...