Test lens


iaperturez

New Member
Mar 6, 2010
9
0
0
#1
I'm going to buy a brand new Sigma 50mm f1.4 lens. But heard a lot ppl say that the sigma lens got front & back focus problem. I have no idea how to test. Any experts here to share the methods of testing the lens in the shop when buying the lens. :)
 

pokiemon

Senior Member
Mar 5, 2005
2,039
0
0
#3
yep. read the link octarine has sent to you. if you still dont understand how it works, post your questions here!
 

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