Polished 90 mm dia & 20 mm thick approx.
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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.
Ground & polished faces, edges ground. Size 50 mm high & 45 mm wide.
With holder & choke 80W & 120W
Diffraction Gratings replica mounted on a plate glass.. 2400 (lines/in) 7500 (lines/in) 15000 (lines/in)
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