I have to give my standard "Diopter Sight Pep Talk" here, LOL.So scopes only for me these days.... But that does not stop me from appreciating and admiring the precision and craftsmanship in these sights.
German match sights all use a standard eyepiece thread (9.5 x 1.0mm), for which many nifty accessories are made. The secret - especially for older eyes - is to replace the OEM eye disk (typically with a small opening around 1mm) with an adjustable iris allowing you to adjust the aperture size to fit lighting conditions. You can add colored filters, polarizers, and a focusing 1.5x magnifying lens to these, but the basic adjustable opening is the big step forward.
Check this page out:

Rearsight Irises

I use this older Gehmann (with iris + lens) the most.
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