Mamiya has released three versions of the RB67. The basic formula is unchanged, only minor things changed in each revision.
RB 67 Pro (Original) 1970
- 3lb 8 oz without a lens
- X flash sync up to 1/400 sec because the camera uses a leaf-shutter–an iris shutter in the lens rather than in the body. However, 1/400 sec is not just your max sync speed, it is also your max speed, period.
- Removable backs for 120 film and 220 film that can be changed mid-roll
- Revolving back, instead of rotating the whole camera to get a horizontal composition you just rotate the back.
- Macro is feasible with most lens due to the bellows focusing, 1:1 possible for wide angle lens.
- Mirror lock up mode–you’ll probably need it because the mirror is huge
RB 67 Pro-S 1974
Same as Pro, plus
- double-exposure interlock
- viewfinder landscape/portrait orientation indicator
- self-erecting focusing hood
- Focus lock
- some later models have larger light baffles to allow for 6×8 backs.
RB67 Pro-SD User Guide from mamiya.com
RB 67 Pro-SD 1990
same as Pro-S, plus
- Larger throat needed for two KL lenses 75mm shift and 50mm
- 6×8 backs
- Has larger light baffle to allow for 6×8 backs.
- Due to the larger throat, it is recommended to use a special spacer adapter to firmly mount Non-C and C lenses. However, Mamiya indicates that these lenses can be mounted without the ring adapter.
Manual from mamiya.com
Suggestion: Buy a Pro-SD unless you find a particularly great deal. The price difference does not seem to be that great right now.