Newbie alert! Newbie alert! I currently have a 210mm on my 4x5 (Cambo monorail). I'd like to have something a little wider, but how do I decide whether to look for a 135mm or a 150mm? I don't really have the money to get both and see. I don't have anyone nearby to rent from or borrow from (as far as I know). Can I equate one or the other to a 75mm on 645? How much difference is there really between the 2 anyway? Yes, I know I'll get about 10 opinions from 8 people, but I'm asking anyway.
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