The Mamiya RB67 65mm f/4.5 is a wide-angle Sekor lens designed for the RB67 6×7 medium format SLR system. It covers a noticeably wider field than the 90mm standard lens and was aimed at landscape, architectural and environmental work in the studio and on location.

Hammer prices for this lens at recent UK auction sit at the modest end of the RB67 system: the only verified saleroom result in our records is £70 in May 2025, which gives a working reference point for what a clean copy sells for today. With a single data point the spread cannot be properly bracketed, but it confirms the 65mm f/4.5 is among the more affordable wide options in the RB67 range, and condition is what determines whether a lens is worth the asking figure or not.