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03-13-2010, 09:01 PM   #1
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manual focus at infinity

I'm comparing several FA 77mm Ltd copies. One test is to shoot scenes with objects at infinity with the manual focus set to infinity. One lens seems blurry then, while sharper on autofocus. Are they supposed to be sharp with remote objects when manually turned to the limit, on infinity?

03-13-2010, 10:10 PM   #2
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You can't just turn to infinity and expect any given object to be in focus - infinity is a relative thing. You have to actuly focus if you want the object in focus. Most lenses actually focus slightly beyond infinity when turned all the way.
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