#23A Light Red - Blocks blue and green light completely. Passes light longer than 600nm. This filter will block the sodium lines from low pressure sodium lights and effectively darkens the night sky from a variety of light sources including the moon. The H-apha light nebulae is passed completely. A good filter to use when the moon is up.
|Name||Optec - #23A Light Red, mounted in 48mm threaded cell.|