Optical Filters for Astronomy Applications
We 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 maximize transmission.
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 apertures of f/4 or smaller. We provide custom coating services for more demanding imaging applications requiring larger apertures such as f/3 or f/2. We also can provide larger sizes and unique passbands upon request.
Product Type
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H-Alpha 8nm Bandpass
8nm-wide Hα spectral line filter
H-alpha filters are essential for imaging nebulae and other objects which are rich in ionized hydrogen. At 656.3nm, a narrow-band emission filter is required to separate H-Alpha from the SII doublet (671.6nm and 673.1nm).
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SII 8nm Bandpass
8nm-wide singly ionized sulfur spectral line filter
SII filters isolate the emission from ionized Sulfur atoms, also common in nebulae. Emission is at two lines occurring as a doublet, at 671.6 and 673.1 nm.
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OIII 8nm Bandpass
8nm-wide doubly ionized oxygen spectral line fIlter
Chroma's OIII bandpass filters isolate the 500.7nm primary emission line of doubly ionized oxygen. After ionized hydrogen, this is the next most common emission when imaging nebulae.
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Lum
Luminance filter for enhancing color rendering with RGB set
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Red
Red filter for color rendering with RGB set
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Green
Green filter for color rendering with RGB set
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Blue
Blue filter for color rendering with RGB set
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Jovian Methane Filter
Methane absorption band filter
This filter enhances contrast when imaging objects containing significant levels of methane. Methane-rich components, such as in the atmosphere of the Jovian planets, will appear darker.
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LoGlow Light Pollution Filter
Blocks common spectral lines from lighting sources
This filter provides balanced color for the visible spectrum while blocking most emission from metal-halide and vapor lamp sources which together contribute to sky glow.
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B-Bessell
Blue photometric filter in UVBRI series - Durable, high-transmission sputtered coating
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I-Bessell
NIR photometric filter in UVBRI series - Durable, high-transmission sputtered coating
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R-Bessell
Red photometric filter in UVBRI series - Durable, high-transmission sputtered coating
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U-Bessell
UV photometric filter in UVBRI series - Durable, high-transmission sputtered coating
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