Chroma LoGlow Filter 2" Unmounted

The Chroma LoGlow is a Light Pollution Filter that provides balanced colour for the visible spectrum while blocking most emission from metal-halide and vapour lamp sources which together contribute to sky glow.

About Chroma

Chroma Technology is an employee-owned company based in Vermont, USA. Chroma manufacture the highest quality astronomy filters with durable, sputtered hard coatings using single substrates of the best glass, eliminating the need for laminations. All primary filter coatings are applied on the front surface and anti-reflection coatings on the rear surface to prevent ghosting and to maximise transmission. Chroma astronomical filters are used worldwide in research and amateur applications. 

Highly precise and accurate, the passbands of Chroma filters remain spectrally stable and do not drift in response to extreme temperature fluctuations or changes in humidity.

All Chroma filters may be used with focal ratios of f/4 or slower. For optics faster than f/4 then due to the spectral shift, we recommend using 5nm filters instead.

Features of the Chroma LoGlow Filter

Durable sputter coatings

Parallelism: <30 arcsec

Thickness: 1.0 +/-0.05mm

Filters designed for use with CCD and for f/4.0 or slower

Transmitted wavefront better than 0.25 waves/inch

No reflections leading to image distortions or ‘back reflections’

Transmission more than 94% average across the visible spectrum

Blocking OD1.4 for metal halide and vapour lamps