I believe Rodenstock made an older (brass) version that was the inverse, the single element was in the rear. It was called 'hemi-anastigmat', I guess for 'half of an anastigmat'.
Originally Posted by lucaas
I have a very similar lens, same focus length and aperture. The difference is it has “soft focus lens” on the front rim.
I took the elements out, the front is single convex, the rear is two glass cemented.
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