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NEW DISCOVERY. This one is obvious if you think about it, but not so obvious with our conventional thinking of ground glass.
The clear glass does not work like a ground glass! All it does is provide a precise plane(film plane) for the loupe to sit on and complete the correct light path into your eye!! The ideal precision focusing ground glass is actually just a high mag loupe that sits exactly on the film plane!!!! No need for additional glass to get in the way.
You can look through the loupe and "focus" your image by moving closer or further away from the lens plane and aligning the loupe with the lens in the front.
This could prove very useful for figuring out where your rear standard needs to go to get your image into rough focus! Nice!!
