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.
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Center/Edge/Notch Wavelength
Product Type
Filter Type
- Overview
- Overview
27055
Sloan-u
UV photometric filter in Sloan ugriz series - Durable, high-transmission sputtered coating
- Overview
27052
B-Bessell
Blue photometric filter in UVBRI series - Durable, high-transmission sputtered coating
- Overview
- Overview
27056
Sloan-g
Green photometric filter in Sloan ugriz series - Durable, high-transmission sputtered coating
- Overview
27004
H-beta 3nm Bandpass
H-beta filters are also useful for imaging nebulae and objects rich in ionized hydrogen. At 486.1nm, a narrow-band filter is required to separate H-beta from nearby blue and green spectral lines. Although weaker than the H-alpha line, this is often used for visual detection as the longer red wavelengths of H-alpha are difficult to detect by eye.
- Overview
27005
H-beta 5nm Bandpass
H-beta filters are also useful for imaging nebulae and objects rich in ionized hydrogen. At 486.1nm, a narrow-band filter is required to separate H-beta from nearby blue and green spectral lines. Although weaker than the H-alpha line, this is often used for visual detection as the longer red wavelengths of H-alpha are difficult to detect by eye.
- Overview
27006
OIII 3nm Bandpass
Chroma’s OIII filters isolate the 500.7nm primary emission line of doubly ionized oxygen. After H-alpha, this is the next most common emission when imaging nebulae
- Overview
27007
OIII 5nm Bandpass
Chroma’s OIII filters isolate the 500.7nm primary emission line of doubly ionized oxygen. After H-alpha, this is the next most common emission when imaging nebulae
- Overview
27008
OIII 8nm Bandpass
Chroma’s OIII filters isolate the 500.7nm primary emission line of doubly ionized oxygen. After H-alpha, this is the next most common emission when imaging nebulae
- Overview
27051
V-Bessell
Green (Visible) photometric filter in UVBRI series - Durable, high-transmission sputtered coating
- Overview
- Overview
- Overview
27057
Sloan-r
Red photometric filter in Sloan ugriz series- Durable, high-transmission sputtered coating
- Overview
27053
R-Bessell
Red photometric filter in UVBRI series - Durable, high-transmission sputtered coating
- Overview
27001
H-alpha 3nm Bandpass
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).
- Overview
27002
H-alpha 5nm Bandpass
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).
- Overview
27003
H-alpha 8nm Bandpass
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).
- Overview
- Overview
27009
SII 3nm Bandpass
SII filters isolate the spectral emission of singly ionized 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).
- Overview
27010
SII 5nm Bandpass
SII filters isolate the spectral emission of singly ionized 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).
- Overview
27011
SII 8nm Bandpass
SII filters isolate the spectral emission of singly ionized 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).
- Overview
27058
Sloan-i
Infrared photometric filter in Sloan ugriz series- Durable, high-transmission sputtered coating
- Overview
27054
I-Bessell
NIR photometric filter in UVBRI series - Durable, high-transmission sputtered coating
- Overview
27012
Jovian Methane
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.
