I'm considering doing some macro work. I have macro lenses for 35mm (Takumar and Rokkor), bellows and extension rings. I even have extension rings for 6x6 and a Mamiya TLR with built in bellows.

Obviously, I will experiment with everything, but I'm still interested in others' experiences.

The question is: Which is sharper: macro lens, regular lens on rings or bellows, or regular lens reversed?

Variables: specific lenses (of course), actual magnification, film format, etc.

Whadaya think?