While I was testing my new lenses (shooting focus and sharpness charts) I noticed something with my DA 40 Limited.
While looking at the lens off the camera, I noticed that the diaphragm, while fully closed, didn't make a circle. One of the blades is not fully closing, so instead of a complete circle, there is a circle with a point at one end.
I didn't think this was right, so I manually opened the diaphragm while looking at the lens and the diaphragm blades open somewhat erratically, not in a smooth motion like I'd expect.
The aperture doesn't stay in the center of the lens while opening the diaphragm, it moves around when opening and closing the blades.
Is this normal, or do I have a defective unit?
It seems like they should all open and close at once so that the aperture would remain in the center of the lens.
I checked all my other lenses and none seem to have this problem.
Do any of you guys/gals have a DA 40 that does the same thing?
Last edited by Colorado CJ; 12-24-2010 at 11:41 AM.