I recently tried to test my lens sharpness, please see the post here:
It seems that my 50mm/f1.8 lens is not sharp wide open.
So here comes the question: when we buy lens at the shop we can't really do the sharpness testing (need a PC to view the 100% crop). So if we found out later at home after some tests that the lens is not sharp, is it possible to do exchange at the shop? Personally I thought it might not be possible here in Singapore. Then what do we do? Any ideas or experience?
Thanks for viewing and helping.