Hello , i'm about to buy me a 90mm super angulon lens(old one) for 500$ (hope n ot to much?) because i love to take pictures of castles and other huge buildings but here's my question : is the difference big enough between the 90mm and the 105mm i'm using now ? the 105mm does not have a big lens-circle(or how do you ca ll it in english ?) and so i can't move the front or back of my camera .(cambo 4 x5")
patrick.
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