Sapphire Window, 5.250 Inch Diameter
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|Dimensions||4 × 8 × 8 in|
|Cosmetic Condition||5 - New/Like New|
|OEM Name||Brand Unmarked|
This appears to be a sapphire window. It is very heavy and has a relatively high refractive index. It was checked with an optical flat and must be classified as a ‘window’ (see photos of front and rear). Characteristics are as follows:
Diameter � 5.250 inch.
Thickness � 0.126 inch
Coated both sides � Mag Fluoride
The window has no discernible flaws. Coating is strong on both surfaces.
Photo set 1999.
***OEM Brand Unmarked