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

Chroma’s complete LRGB filter sets include four individual filters - luminance, red, green, and blue.

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 these filters remain spectrally stable and do not drift in response to extreme temperature fluctuations or changes in humidity.

All filters may be used with focal ratios of f/4 or slower.

Features of the Chroma LRGB Set

Durable sputter coatings

• Parallelism: <30 arcsec
• Thickness: 3.0 +/-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’

Chroma 3nm H-alpha filters are essential for imaging nebulae and other objects which are rich in ionised hydrogen. At 656.3nm, a narrow-band emission filter is required to separate H-alpha from the SII doublet (671.6nm and 673.1nm).

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 H-Alpha Filter

• CWL: 656nm, Bandwidth: 3nm
• Durable sputter coatings
• Parallelism: <30 arcsec
• Thickness: 3.0 +/-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’

Chroma’s OIII filters isolate the 500.7nm primary emission line of doubly ionised oxygen. After H-alpha, this is the next most common emission when imaging nebulae.

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 OIII Filter

CWL: 500.7nm, Bandwidth: 3nm

• Durable sputter coatings
• Parallelism: <30 arcsec
• Thickness: 3.0 +/-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’

Chroma SII filters isolate the spectral emission of singly ionised sulfur atoms, also common in nebulae. Emission is at two lines occurring as a doublet, at 671.6 and 673.1 nm. This filter also separates sulfur emission from H-alpha emission (656.3nm).

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 these filters remain spectrally stable and do not drift in response to extreme temperature fluctuations or changes in humidity.

All 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 the 5nm filters instead.

Features of the Chroma SII Filter

CWL: 672.4nm, Bandwidth: 3nm

• Durable sputter coatings
• Parallelism: <30 arcsec
• Thickness: 3.0 +/-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’