{"overview":"The Rodenstock 300mm f\/9 Geronar is a large-format taking lens designed for view-camera use, sitting in Rodenstock's budget-tier line aimed at landscape and studio photographers who needed a usable 300mm focal length without paying Sironar or Apo-Sironar prices. Its modest f\/9 maximum aperture keeps the lens compact and light for its focal length, making it a practical long lens on 4x5 and 5x7 cameras.","market_narrative":"UK auction data for this lens is thin: a single hammer result of £220 in November 2025 is the only verified sale on file, so today's working value sits around that figure rather than a true range. Because that price is a saleroom hammer result — wholesale, before commission — clean, shutter-tested examples can sell for somewhat more through dealers, and condition of the Copal shutter is usually the largest single factor in what a Geronar is worth.","buying_guide":"Inspect the glass under a strong torch for fungus, haze and cleaning marks, particularly on the inner cemented surfaces where separation can show as a coloured fringe at the edge. Check the aperture blades for oil and confirm the iris snaps cleanly across all stops, then fire the Copal shutter at every speed — sticky slow speeds are the most common fault and a service is not cheap relative to the lens's price. Finally, check that the focus and aperture rings turn smoothly and that the retaining rings and flange are present, since missing hardware is awkward to source.","specs":"Provided data lists only the headline specification: a 300mm focal length at a maximum aperture of f\/9, sold under Rodenstock's Geronar name for large-format use.","faq":[{"q":"What is a Rodenstock 300mm f\/9 Geronar worth today?","a":"On the limited UK auction evidence available, a clean working example sells for around £220 at hammer, with retail prices typically a little higher once dealer margin and shutter servicing are factored in."},{"q":"How much does a Rodenstock Geronar 300mm sell for at auction?","a":"The most recent verified UK hammer price is £220 from November 2025; with only one sale on record the market value should be treated as indicative rather than a firm range."},{"q":"Is the 300mm Geronar a good budget large-format lens?","a":"It was Rodenstock's entry-level 300mm and remains a sensible choice for photographers wanting a long lens on 4x5 or 5x7 without the price of an Apo-Sironar, provided the shutter and glass check out."},{"q":"What should I check before buying one?","a":"Prioritise shutter accuracy at slow speeds, absence of fungus or separation in the elements, and clean, oil-free aperture blades — these drive both usability and resale value."}],"confidence":35,"reasoning":"Only one verified sale and no detailed SPECS or variant data, so pricing and technical claims are deliberately conservative."}

{"overview":"The Rodenstock 360mm f\/9 APO-Ronar is a long-focus apochromatic process lens in a large-format barrel or shutter mount, typical of the type used for high-resolution copy, repro and view-camera work. Its slow f\/9 maximum aperture and apochromatic correction were designed for flat-field reproduction at or near 1:1, and it has since been adopted by landscape and studio photographers on 5x4 and larger view cameras.","market_narrative":"At recent UK auction, hammer prices for the 360mm APO-Ronar have sat in a narrow band, with the two recorded sales fetching £69 and £106, giving a median of around £88. That is what a clean copy sells for at saleroom level today, and the price a buyer pays at retail from a dealer is typically higher once commissions, warranty and margin are added.","buying_guide":"Inspect the glass carefully for fungus, internal haze and cleaning marks, as these long process lenses often sat in studios for decades and softer front coatings can show wipe scratches. Check that the aperture blades are dry and snappy with no oil migration, confirm the iris ring moves smoothly through its full range, and look for any sign of element separation (edge discolouration or a rainbow sheen) given the cemented apochromatic groups. If the lens is mounted in a shutter rather than a plain barrel, fire it at every speed to confirm the shutter is not sluggish.","specs":"Key specifications from the supplied data: 360mm focal length, f\/9 maximum aperture, Rodenstock APO-Ronar apochromatic process design.","faq":[{"q":"What is a Rodenstock 360mm f\/9 APO-Ronar worth?","a":"Based on UK auction hammer results, recent examples have sold for £69 to £106, so fair value for a clean user copy sits around £85–£100."},{"q":"How much does a 360mm APO-Ronar sell for at auction?","a":"The two most recent UK hammer prices in our sales history were £106 in March 2023 and £69 in March 2022, indicating a typical price in the high double digits to just over £100."},{"q":"Is the APO-Ronar a good lens for large-format photography?","a":"Yes — although it was designed as a process lens for 1:1 reproduction, the 360mm APO-Ronar is widely used on 5x4 and larger view cameras for its high resolution and flat field, provided the glass is clean."},{"q":"What should I check before buying one?","a":"Prioritise clear glass free of fungus, haze and separation, dry aperture blades, and — if shutter-mounted — accurate speeds across the range."}],"confidence":45,"reasoning":"Only two unverified sales records and no SPECS or variant data are provided, so market range is narrow and specification detail is limited to what is stated in the model name."}