Item

Consisting of

Function

Absorbance Values Certified at nm

666-F0

Empty Filter Mount

Blank

666-F1

Holmium Oxide Glass

Checking the Wavelength Accuracy

279; 361; 454; 536; 638

666-F2

Neutral Density Glass NG 11

Checking the
Photometric Accuracy

440; 465; 546,1; 590; 635

666-F3

Neutral Density Glass NG 5

666-F4

Neutral Density Glass NG 4