Bausch & Lomb (B&L) 33-53-09-29  Precision Grating, 1800 Groove / mm, Excellent Condition

This is a certified precision Bausch & Lomb optical grating. Much of the following information was taken from the nomenclature label fixed to the back of the grating substrate.

Grating size - 65 x 65 mm
Focal length - infinity
Grooves / mm - 1800
Blaze angle - 26 degrees 45 minutes
Catalog number - 33-53-09-29
Serial number - 2209A2B3
Coating - Al (?)

This grating appears to be in excellent condition and includes a special protective plastic cover.

Photo set 1658