Just got this very clean Contax IIIA from it's early T xxxxx production, along with a much later Carl Zeiss 5cm/1.5 Sonnar. Everything is in great working order... shutter speeds seem appropriate, rangefinder is right on, glass is spotless. The only thing is the meter seems to be underexposing by about 1.5-2 stops. My question is, can the aperture dial be adjusted easily vs the DIN setting, to give a correct reading or will this still underexpose by the same 1.5-2 stops. If it could read 50-60/sec @ F4, it would be the correct light level I am measuring.
I know if I just set the DIN to 27 when using 100 speed film, it will give the correct reading then. Otherwise I am very happy with this addition to my Contax IIA's and other Zeiss lenses.