Widelux filter diameter?

The diameter of the glass itself is about 21.5mm fit tight. What exactly are you trying to do? I might be able to help with measurements as I have one original Widelux filter somewhere.
 
A RF member from Australia is offering 3D printed filters for Widelux (with or without glass). I bought it and it works really well. I also had a local optician to cut a +0,5 diopter to fit into this filter frame, so it is quite an universal thing.
 
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