Originally posted by chasintrail RioRico - I've never used a bellows. Strangely enough I have one that came with the huge kit of stuff that I go with my Canon F-1 at an estate sale. Any suggestions on a good place to find out information on how to set up and use one? Also, any idea if a Canon bellows would be usable with a Pentax.
I have no experience with Canon SLRs so I can't comment on Canon bellows usage. A Canon bellows *could* be use with Pentax gear, but only with surgery and/or adapters. As in, remove the Canon mounts and replace them with Pentax mounts. I don't know if that is feasible.
My Chinese-made PK bellows cost around US$35 used; my two old M42 bellows, one German, one Japanese, were a bit less. Pentax-made bellows cost more so I haven't checked their market prices -- I'm cheap. Using either mount system with non-camera glass, like enlarger and projector lenses, involves about the same number of adapter rings, which are all pretty cheap. But if you will use reversed camera lenses, a PK bellows would be more straightforward.
Here are some possible setups:
* enlarger lens -- M39-M42 adapter -- M42 bellows -- M42-PK adapter -- camera
* M42 camera lens -- M42 tubes -- M42 bellows -- M42-PK adapter -- camera
* weird lens in PK body cap -- PK tubes -- PK bellows -- more tubes -- camera
* reversed camera lens -- PK mount-reversal ring -- PK bellows -- camera
I include tubes in those setups for use with longer lenses, or for more extension than the bellows alone can provide. Tubes can go on either side of the bellows, maybe on both sides if you use a VERY long lens. (I've a 300mm large-format anastigmat that requires nearly every tube I own.)
The right M42-PK adapter is the cheap safe flanged non-infinity focus sort, not the Official Pentax adapter nor its worrisome clones. A mount-reversal ring must be matched to the front threads of the lens you're reversing -- but it needn't be a Pentax lens! ANY brand of lens with matching threads can be reversed! That's how I recycle some otherwise useless Minolta glass. Reverse anything and you have Yet Another Macro Lens (YAML). So I have 49mm, 52mm, 55mm, and 58mm mount-reversal rings. I am ready!
Don't confuse mount-reversal adapters with thread-reversal rings, which are used for 'stacking' lenses for extreme magnification. That's a whole 'nother can of worms which I won't open now -- it's bedtime, in the morning I'll take off for a few days, so I'll be back here early next week. Cheers.