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Author Message   Cooltouch Tinkerer Username: Cooltouch Post Number: 193 Registered: 01-2009 Rating: N/A Votes: 0 Posted on Tuesday, January 03, 2012 - 09:28 pm:    Something I've been wondering about recently -- do you happen to know if the eye-level prism glass is interchangeable between the F and F2 prisms? F prisms seem to sell for much less than F2 ones, which is why I'm asking.