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.

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.