John Seaman , Apr 18, 2007; 03:04 a.m.
Don't know about testing it but my Lumaxar (75mm not 80mm) is capable of very sharp & contrasty images. The camera was not very good with a strong light source at the front, even with the hood fitted, due to loss of contrast & flare. I feel that this was due to lack of light baffling and shiny paint in the camera body rather than the lens. I have improved this by putting extra light baffles in the camera body and repainting with matt (flat) black. Other issues affecting performance may be focussing and dirt or scratches on the lens.