{"overview":"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.","market_narrative":"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.","buying_guide":"Inspect the elements for fungus and haze, particularly between the rear groups where RB67 Sekors are prone to internal bloom, and check the aperture blades for oil migration that can slow the leaf shutter. Confirm the in-lens leaf shutter fires accurately at all speeds, that the cocking linkage engages cleanly with the body, and that focus and aperture rings move smoothly without grit or stiffness. Look for coating scratches, edge separation and dents to the filter ring, all of which depress value at resale.","specs":"A wide-angle 65mm lens with a maximum aperture of f\/4.5 in the Mamiya RB67 bayonet mount, with the system's characteristic in-lens leaf shutter rather than a focal-plane shutter in the body.","faq":[{"q":"What is a Mamiya RB67 65mm f\/4.5 worth today?","a":"Based on UK auction hammer data, a working copy has sold for around £70, so that figure is a reasonable benchmark for current value, with cleaner examples likely to price somewhat higher."},{"q":"How much does a Mamiya RB67 65mm f\/4.5 sell for at auction?","a":"The most recent verified UK saleroom result in our records is £70 in May 2025, which sets the wholesale price level for an average-condition copy."},{"q":"Is the RB67 65mm f\/4.5 a good wide-angle for the system?","a":"It is one of the wider focal lengths in the RB67 Sekor line-up and was designed for landscape, architectural and interior work where the 90mm standard lens is too tight."},{"q":"What should I check before buying one?","a":"Confirm the leaf shutter fires correctly at all speeds, inspect the glass for fungus and haze, check the aperture blades for oil, and make sure focus is smooth and the mount engages cleanly with the body."}],"confidence":35,"reasoning":"Only one verified sales record and no SPECS or variant data were supplied, so market commentary and specifications are necessarily limited."}