>>2705678Get an m42 adapter and buy some shitty soviet lenses. I just got a 200mm 1:4 for £25. I got a 50mm 1:8 for about £20.
I've been able to experiment and find out what kind of lens would be a great investment.
Vintage lenses keep their value so should be able to sell them for about the same as you paid for them.
I keep some for use in places where I don't want to risk a good lens.