If I had just a little dough for 3 Canon FD lenses they'd be the 35-105 mentioned several times ( great lens but lousy non-macro close focusing distance ) and a 50mm (1.4, 1.8, both are great) and then I'd save up my pennies for the 400mm f4.5 one of the best 400mm lenses ever made. Heavy, sharp, useful as a club in hand-to-hand combat.