Product Description
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 - 150
Blaze angle - 26 degrees 45 minutes
Catalog number - 35-53-0988
Serial number - 899-3-11
Coating - Al (?)
This grating appears to be in fair condition and includes a special protective plastic cover. There are several blemishes in the surface including several fine scratches. Good for experimentation.
Photo set 1660