Originally Posted by
mdarnton
This will be interesting. My understanding of it is that the earlier lens was already essentially an Apo lens, and when Schneider brought out their Apo-Symmar, Rodenstock was just forced to play catch-up and added Apo to the name, without changing the lens. There is, however, the additional consideration that the "Apo" version will inevitably be newer, and therefore everything will likely be in better state of preservation. There's also the added issue that at one point Rodenstock was having trouble with lenses coming eventually de-cemented internally, and I THINK some of the earlier Sironar-Ns fall within this period, where the Apo version doesn't.
If I'm wrong about these things, someone will correct me, I'm sure.
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