[KenCo]

I have the bellows and rail and use a Carl Zeiss jena tessar 50mm f2.8 lens with an aperture dial on the lens. Haven't used extension tubes so can't compare....the only thing I'd add is using bellows isn't for the easily discouraged, as depending on magnification they don't let in much light and therefore if the subject is fast moving it becomes pretty impossible to shoot, although to be fair most of my attempts were under very poor light and before I got myself a flash....Haven't used the bellows for sometime but they are real fun to play with and the magnification is excellent. Unfortunately I don't have any processed images to show but if you'd really like to see something I'll sort one out for you.