I believe that the fan had an asymmetrical axis which rotated around a true (measured) axis - mitigating any "blind spot" issues.
I believe that the fan had an asymmetrical axis which rotated around a true (measured) axis - mitigating any "blind spot" issues.
But would using a central ND filter (or any standard glass filter) cause some issues - due to its refractive properties...when placed over such a curved optic? Just guessing here, mind you!
I also doubt it would work with a 135° lens that is not retrofocus nor is made according to the Roosinov's aberrational vignetting principle (like all the Biogons, Grandagons, etc., etc.). A spherically curved filter may probably be a solution.... but certainly not a cheap one.
Between the lens elements, the filter just wouldn't work as a center filter.
What I would like is to have an option to put yellow/green/orange/red gel filters inside the lens. It would be good for both modifying the image tones and cutting the influence of the chromatic aberration down.
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