Today I received my copy of this lens. The first thing I do, when receive an old MF lens is to check the aperture stops and blades functionality.
This lens is very strange. If you set the lens to f/2.8 and then stop it down, you really don't notice any aperture blades movement till f/4.5... When I open the aperture from f/4.5 to f/4, I can see the blades disappear, but not showing again, when I move it back from f/4 to f/4.5.
It seems not normal to me. This means that f/2.8, f/3.5 and f/4 are the same aperture stops for this lens?!
I checked the exposure with my K100D and found out, that the exposure really isn't consistent.
Did anybody else notice this "feature"?