Hi, I just developed a roll which I shot with my Super A and using two lenses:
* 1st part with the Super-Multi-Coated Takumar 50 f/1.4, most shots manually metered with the lens wide open * 2nd part with the SMC A 50 f/2, most shots on program mode The shots on part 2 are all overexposed... I don't use program mode that often (mostly aperture priority), so could it be that this mode is malfunctioning? The diaphragma control by the camera is certainly doing something; I did a quick test in shutter priority mode and saw the diaphragma change when selecting different shutter speeds. If I set the camera to shutter priority and select a shutter speed that gives a f/2 aperture, I can see the diaphragma blades close very slightly when releasing the shutter. I don't think this should happen. When setting the aperture to f/2 manually, I don't see them moving. On the other hand, they don't come out as far as they do on f/2.8, so if this is the problem, it could only account for a 0.5 stop *under*exposure, and I have several stops of *over*exposure... What else can go wrong? What is actually the mechanism that controls the diaphragma blades in program mode? Is it in the camera? For manual diaphragma, it's obviously in the lens... can there be a misalignment somewhere?? How can I test this... I didn't have a problem yet with the SMC A on manual mode, so maybe I should have a test roll with each time two shots: one on program mode and one with identical settings, but on manual mode... I only have one SMC A lens, so can't compare any further. other ideas? Groeten, Vic -- PDML Pentax-Discuss Mail List [email protected] http://pdml.net/mailman/listinfo/pdml_pdml.net
