{"overview":"The Mamiya Sekor 135mm f\/4.5 is a medium telephoto lens designed for the Mamiya C-series twin-lens reflex cameras, including the C220, C330 and their later f and s revisions. As a paired-element TLR optic, it covers 6x6 medium format and was intended for portraiture and short-telephoto reach on a bellows-focusing TLR body.","market_narrative":"At UK saleroom level, hammer prices for this 135mm have ranged from £15 to £60 across recent results, with a median around £38 — a reminder that auction hammer figures sit below typical retail asking prices and exclude buyer's premium. Clean, working examples sell for the upper end of that band, while incomplete or hazy copies fetch the lower figures. As of 2026 the lens remains one of the more affordable entry points into the C-series system, and its value at auction has stayed broadly flat over the last two years.","buying_guide":"Inspect the front and rear elements under a strong light for fungus, haze and coating scratches, all of which are common on TLR optics of this age. Check both the taking and viewing lens, confirm the aperture blades are dry and snappy with no oil bleed, and work the cocking lever and shutter at every speed to confirm the in-lens leaf shutter fires cleanly. Focus is handled by the camera's bellows rather than the lens itself, but verify that the lens panel seats squarely and that the shutter linkage engages without binding.","specs":"Specifications beyond the 135mm focal length and f\/4.5 maximum aperture are not provided in the source data for this entry.","faq":[{"q":"What is a Mamiya TLR 135mm f\/4.5 worth today?","a":"Recent UK auction hammer prices have sat between £15 and £60, with a median around £38, so a clean working copy is typically worth in the £40–£60 range at saleroom level before commission."},{"q":"How much does a Mamiya 135mm f\/4.5 sell for at UK auction?","a":"Across the last two years it has sold for as little as £15 for a poor example and as much as £60 for a tidy one, making it one of the cheaper lenses in the C-series TLR line-up."},{"q":"Is the price affected by which TLR body it fits?","a":"The lens mounts on any of the interchangeable-lens Mamiyaflex and C-series TLRs (C, C2, C3, C220, C330 and their f and s variants), so body compatibility does not materially shift its auction value."},{"q":"What faults most affect the value of this lens?","a":"Fungus, internal haze, oil on the aperture blades and a sticky or inaccurate leaf shutter are the main issues that push the price toward the bottom of the observed range."}],"confidence":45,"reasoning":"Only five sales records and no specs, variants or factual data were supplied, so price commentary is supported but technical detail is intentionally limited."}