Who here uses vintage manual lens?

[arthurking83]

..... I've thought about getting some adapters to switch them over to my 5DII but the crop factor is going to annoy me.

crop factor??

I'm as confused as Am is.

What's this crop factor?

And I'm curious as to what makes the focus rings "fantastic" too?

Focus rings are focus rings, and unless it turns through more than 360° they're all pretty much the same to use(except for the really dinky kit lens type focusing ring).