The Rodenstock Sironar 210mm f/5.6 is a large format plasmat-type lens intended primarily as a standard optic for 5x4 sheet film and a moderately wide option on 5x7. It is supplied in a leaf shutter for use on monorail and field cameras, covering the typical studio, landscape and architectural work associated with the focal length.

At recent UK auction, hammer prices for the 210mm Sironar have ranged from £60 to £200, with a median closer to £90 based on the limited sample of three sales between 2022 and 2025. As of 2026, this remains a wholesale, saleroom-level value — clean copies in a reliable Copal shutter tend to sell for more, while examples with shutter faults or cosmetic wear pull the price down. Buyers asking what a Sironar 210mm is worth should expect that condition and shutter accuracy, rather than cosmetic grading alone, drive where an individual lens lands in that range.