9cm x 14.5 cm , pack of 25 sheets.
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Made of optically flat plates cemented together. Dimensions 50 x 50 x 50 mm
Optically worked, in velvet lined case
Comprising a metal holder with sides grooved to hold the lens or mirror. The holder is finished in matt black & is free standing for bench use, to hold lens 50 mm in diameter.
Plane, circular, ground edges. Back silvered with protective coating
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