{"overview":"The Corfield 35mm f\/3.5 Retro-Lumax is a wide-angle prime lens made for the British Corfield camera system, dating from the era when K.G. Corfield was producing 35mm equipment in the UK. It is a moderate-aperture wide-angle suited to general scenic and reportage use on a Corfield body.","market_narrative":"Auction evidence for this lens is thin: a single recorded UK auction hammer result of £94 in March 2023 gives the only firm reference for what the Retro-Lumax is worth at saleroom level. With one data point, the going price today should be treated as indicative rather than established, and clean, fungus-free copies in original caps and case may sell for somewhat more when they appear; rougher examples typically realise less. The market value of British Corfield optics remains a niche collector area in 2026, so realised prices vary widely between sales.","buying_guide":"Inspect the front and rear elements carefully for fungus, internal haze, and coating scratches, all of which are common on lenses of this age. Work the aperture blades to confirm they snap cleanly with no oil residue, and turn the focus helicoid through its full travel to check for stiffness, dry grease or grit. Confirm the mount and rear baffles are intact, as service parts for Corfield optics are essentially unobtainable.","specs":"Listed specifications are limited to a 35mm focal length and an f\/3.5 maximum aperture in the Retro-Lumax wide-angle line for the Corfield system; further optical and mechanical details are not documented in the supplied data.","faq":[{"q":"What is a Corfield 35mm f\/3.5 Retro-Lumax worth today?","a":"The only verified UK auction hammer price on record is £94 from March 2023, so that figure is the best available reference for what the lens sells for, though single-sale data should be treated cautiously."},{"q":"How much does a Corfield 35mm f\/3.5 Retro-Lumax sell for at auction?","a":"Recorded sales are limited to one result at £94 hammer; clean, complete examples may achieve a modest premium and damaged or hazy copies typically sell for less."},{"q":"Is the Corfield 35mm f\/3.5 Retro-Lumax a collector item?","a":"Yes — it is a niche piece tied to the British Corfield camera system, and its value is driven more by collector interest in Corfield equipment than by optical performance."},{"q":"What should I check before buying one?","a":"Look closely for fungus, haze, coating scratches, oil on the aperture blades and a stiff focus helicoid, as servicing options for Corfield lenses are extremely limited."}],"confidence":30,"reasoning":"Only a single sales record and no SPECS or facts were supplied, so both market and technical claims are necessarily limited."}