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DIY Ground Glass

An interesting alternative to ground glass...

... from none other than Sir David Brewster, 1853:

Lay a piece of clean glass flat and level on a surface.

Pour just enough skim/1% milk on the surface of the glass to cover it completely.

Let it dry!

(spray it with matte fixative afterwards to prevent "deterioration" of your focusing surface!).

– from Primitive Photography by Alan Greene, Focal Press, 2002 ISBN 0-240-80461-9