It is me again, with yet another newbie question. I want to buy some more lenses, and i have read various opinions here and elsewhere. i would like to know how everyone is judging the quality of a lens. with a digital like the 10D, i am guessing that pictures are taken wih sigma and then L series lens, non-L lens, etc. and then compared on screen. Or are the comparisins made on the same printer. can someone post a picture of a 'terrible' 3rd party lens and one of an L lens to see if a novice can tell the difference. thanks
