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Latest Review Posted	SMC Pentax 200mm F4 I use this lens with FF camera Sony A7. This is a fantastic lens which is as sharp as zeiss lenses for only 70$. I test this lens sharpness with ISO12233 chart printed on A1. Lens is sharp in all apertures except differaction limits. My results about this lens are: On f/4 there is slight vignetting. No optical distortion. Sharping is excellent on center f/4 between f/22. Lens is less sharper on center between f/22 and f/32 because of differaction. Sharping is excellent on corners f/4 between f/22. Lens is less sharper on corners between f/22 and f/32 because of differaction. Best shooting aperture is between f/4-f/22. Lens sharpness is really amazing between f/4-f/22. Most probably lens can be used without differaction limit with 12Mp FF camera I cannot see a difference on sharpness with Zeiss 55mm For charts please check kirlisensor.com