Edmund Optics hard-coated filters are available in diameters from 12.5 to 50 mm

TECHSPEC hard-coated filters include OD 4 shortpass filters in wavelengths from 400 to 1300 nm in 12.5, 25, and 50 mm diameters. The OD 4 longpass filters handle wavelengths from 325 to 1300 nm in diameters of 12.5, 25, and 50 mm. Ninety models of imaging filters are also available.
Edmund Optics
Barrington, NJ
www.edmundoptics.com