I often wondered what the difference is between Euryscope/aplanat/rapide rectilinear. I the aplanat is the European name for the RR, but what about the Euryscope? It came out about the same time as the RR/Hemispherique/aplanat, but is it the same lens? And then there's the "symmetrical"! I have a very small sized RR by E&HT Anthony that covers 4x5, but it seems very small compared to the RR lenses of the 1870s. What's up with that?
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