Quote Originally Posted by brucemuir View Post
What is the material used for the Leica screwmount series that is a red/rubylith type material that screws onto the front round rangefinder window.

Anyone know?

I saw this method mentioned over on graflex.org years back also.
I think this is what you might want, a Lee filters sample book

www.ebay.co.uk/itm/Old-LEE-filters-numeric-edition-swatch-book-fabulous-rare-collectable-/330804589218?pt=LH_DefaultDomain_3&hash=item4d057d 72a2

You will find lots of translucent filter samples of all types that are suitable for cutting up to 'invent' things with.