80/2.8 or 110/2.8 lens for Mamiya 645

[altair]

Jeff: I already did, have both now.

Pumalite: Thanks for your input. Still wondering if ext tubes are the same thing as ext rings.

[fschifano]

Same thing. Extension tubes = extension rings.

[altair]

Thanks for the clarification, Frank.

[JonPorter]

To clarify further, close-up lenses and extension tubes are not the same thing. Close-up lenses are used to extend a lens' minimum focus for, say, a tighter head shot or detail shot while still hand-holding the camera. Extension tubes are used for macro work, require exposure compensation, and often don't have an auto diaphragm. And there's no image degradation if you use a quality brand close-up lens from B+W, Tiffin or Hoya.

[altair]

Thanks for your input Jon, I appreciate it.