Tiffen 82mm 23A Light Red Filter NITECORE NFG40 so they have designed this

so they have designed this one to be impact-resistant

and provides better contrast than blue or red light for reading or navigating at night

This conserves battery life

The Full-Service Mount offers tool-less micro-adjustments at 8 points for precise and effortless alignment of the displays

Tiffen 82mm 23A Light Red Filter NITECORE NFG40 so they have designed thisIncreases Contrast in B&W Photography Darkens Sky Adds Drama Increases Separation Between Sky Clouds Enhances Red in Color Photography Absorbs Green and Blues Black Aluminum Filter Ring ColorCore Glass Made in the USA 10 Year Warranty The 82mm #23A Light Red Filter from Tiffen is traditionally used in black and white photography when a noticeable increase in contrast is desired. This filter significantly boosts the dramatic effect of the image