The Mamiya RB67 Professional SD is a medium format SLR producing 6x7cm frames on 120 or 220 roll film, with bellows focusing and a rotating back that gives the RB series its name. It was positioned as a professional studio and location camera, and the SD designation marks the later revision of the RB67 line introduced at the start of the 1990s with a revised lens mount that retains compatibility with earlier Sekor C optics.

At recent UK auction, hammer prices for the RB67 Professional SD have spanned roughly £530 to £1,400, with a median around £1,000 depending on what glass and backs are bundled with the body. The 2025 result sits at the lower end at £529 for a body-led lot, while kits with multiple lenses and finders have sold for well over £1,000 at saleroom level; today the camera's value is closely tied to the condition of the bellows, the shutters in the lenses, and whether the 120 back seals light correctly. These are wholesale hammer figures achieved in the UK auction market and exclude buyer's and seller's commission, so retail asking prices from dealers typically run higher than what the RB67 SD sells for under the gavel.