Bandpass 3nm FWHM

CWL 393.3nm +-.5nm

80% or more Transmission at 393.3nm

OD blocking 5.5nm

Substrate Quartz

Hard coated anti-scratch

Filters are dielectric coated and can be cleaned using optical cloth and optical cleaning fluid. 

Remainder of a batch designed to install in scientific equipment as part of a solar monitoring system. 

I have a few of these which are surplus to requirements, after completing the project. These filters usually sell for 4x the price.

PLEASE NOTE: These filters pass a deep violet wavelength which cannot be seen by human eyes. The wavelength is nevertheless dangerous to human eyes! These filters can only be used on a telescope equipped with Baader Astro Solar film or similar, and a mono CMOS astronomy camera, or similar. They cannot be used for visual observation.