[Rena]

Hi there, I just got my new 75mm lens and of course took a whole lot of "test" pics. The sharpness is incredible but only upto f/8. After that the images become unbelievably blurred, actually images taken with 70-300 are much sharper. Is this "normal" and my expectations are too high? Of course to return the lens to B&H shouldn't be a problem if I want to forfeit the shipping costs and quite a high customs duty. I feel I am trapped...

 

The first example is f/5.6, the 2nd one is f/16: 

 

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