The Vivitar Universal Bellows System is one of the best and most versatile bellows ever made. It uses T adapters front and rear so it can be easily adapted to almost any 35mm or digital SLR body ever made (From Alpa to Zeiss) and almost any common SLR lens mount. (It uses standard T or T2 adapters on the rear and a ("female") T flange on the front.) Also, the rear standard of the bellows is not permanently affixed to the back of the rails, so it can be moved forward and used with very short lenses. This one is set up with Canon FD bodies and lenses, but T adapters are readily available to use with other bodies. This is great for someone who has several different camera systems. Pictures at http://www.thecuckoofarm.com/cuckoo/photo/camatt/bell/vivbell/vivbell.php Adapters, for example, from Canon FD to M42 (universal or pentax screw) and from M42 to M39 (Leica) are also readily available if you want to use an enlarging lens for macro work. I have two of these bellows units, but am keeping one. I'm selling the bellows with accessory focusing rail and your choice of EITHER Canon FL/FD or Nikon F manual focus adapters front and rear. Adapters from Canon FD to M39 (Leica) or Pentax M42 thread are available (not included). $75 plus shipping from Washington State. I also have a Novoflex bellows in Exakta mount with focusing rail. $40 plus shipping. Photo on request. Please reply privately.