{"overview":"The Sigma 16mm f\/2.8 XQ is an ultra-wide-angle prime lens from Sigma's XQ line, built for 35mm SLRs and typically supplied in interchangeable mounts covering the major systems of its era. As a fast 16mm it was designed for dramatic wide-field work — architecture, interiors and landscape — where both coverage and a relatively bright f\/2.8 maximum aperture mattered.","market_narrative":"At recent UK auction the 16mm f\/2.8 XQ has been a modest performer, with hammer results of £60 in August 2024 and £69 in March 2023, giving a median around £65. As of today in 2026 that narrow band is what clean, working copies are worth at saleroom level, and buyers asking what the lens sells for should treat the mid-£60s as the wholesale benchmark rather than a dealer retail price.","buying_guide":"Inspect the large front element carefully for coating scratches, cleaning marks and edge separation, all of which are common on wide-angles of this age. Check for fungus and haze in the rear group, confirm the aperture blades are dry and snap cleanly with no oil, and make sure the focus helicoid turns smoothly without stiffness or grease migration; also verify the specific mount matches your body, as XQ-series lenses were produced in several fittings.","specs":"","faq":[{"q":"How much does a Sigma 16mm f\/2.8 XQ sell for at UK auction?","a":"Recorded hammer prices are £60 (2024) and £69 (2023), so expect a working example to fetch roughly £60–£70 at auction."},{"q":"What is a Sigma 16mm f\/2.8 XQ worth today?","a":"Based on the limited auction data its value sits in the mid-£60s; condition, glass clarity and the specific mount will push an individual price toward the top or bottom of that range."},{"q":"Is the Sigma 16mm f\/2.8 XQ a good buy at this price?","a":"At a typical hammer price under £70 it is an inexpensive route into ultra-wide 16mm shooting, provided the coatings, aperture and focus all check out on inspection."}],"confidence":45,"reasoning":"Only two sales records and no SPECS or variant data were supplied, so pricing guidance is directional and technical detail is intentionally limited."}