Which way for the ground glass for a Bergheil?

Joined
Dec 1, 2014
Messages
80
Location
Sweden
Format
35mm
Due to the ground glass for my Voigtländer Bergheil 6.5x9 being extremely dim despite me trying to clean it when in the holder I took it out and gave it a real rinse in the sink. Wow, I gained at least one stop and clearer focus!

Dumb as I am I didn't check which way it should sit in holder. I put it in with the matte side towards the camera as it felt logical, but can somebody give me feedback on it?
 
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