Quote:
Originally Posted by canoman
Unlike years ago when human calculation was used to make the glass, nowadays it is all computerised. So one is an exact copy of the previous one. I think it was Canon who made the proud boast that if you took one down from the shelf it would be an exact copy of another. This is why I do not understand the write up one sees of complaints of front or back focussing errors. I made up a simple checker and checked all of my lens. I did not find one faulty lens. The only fault one sees is build quality, such as stiff zooming etc.
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I was just reading the March issue of PhotoPlus and they said it again about a Tamron lens. On the last test it was so-so but on this one much better for the same model of lens.