I went to shot a roll this morning with my 'new' Aria... noticed a very strange thing. The aperture doesn't seem to couple correctly on the 50 f1.7. When I choose say f11 in Av, the VF tells me I am at f5.6. At f1.7 it reads f1.2... kind of cool if it really were that fast ;-) Any ideas what it may be? Other lenses are fine so I assume it's the lens and not the body. Thanks.