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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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  • Andrea Ricciardi
    Veil Nebula

    Shot from the bad sky of the center of Rome, with some moon too...
    200mm f/4 newton
    Astrel Instruments AST8300B CCD camera

    Filters

    Chroma Technology 3nm spectral line filters: H-alpha, OIII and SII

  • Paul Swift
    Seagull Nebula

    C 2177 is a region of nebulosity that lies along the border between the constellations Monoceros and Canis Major.

    Equipment used

    SX-46 with and SX Maxi wheel from Starlight Xpress Ltd. format array of 27 x 21.6 mm, 6uM square pixels. Newtonian telescope at 1330mm. The second setup was a SX 816 and Vixen VSD refractor.

    Location Image

    Valencia, Spain

    Filters

    Chroma Technology 3nm spectral line filters: H-alpha, OIII and SII, Chroma LRGB Filters

  • Jaspal Chadha
    NGC 281A

    The large dark nebula that makes up this "gaping mouth" is a molecular cloud made up predominantly of molecular hydrogen, but also dust and other gases. New generations of solar systems are being forged within its cold interior. Once these young stars’ fusion engines switch on, they will irradiate their surroundings–heating up, ionizing and eroding away the remaining dark material from which they formed.

    Originally the whole Pac-Man nebula would have been one large dark molecular cloud. The stars that formed early on at its centre have progressively hollowed out the centre of the nebula. The gas in and around this central region is ionized by the copious UV radiation emitted by the central open star cluster (IC 1490), causing it to glow and provide the light by which this narrowband image was taken.

    Location

    London, UK

    Date

    September—October 2015

    Telescope

    Skywatcher Esprit 100ED
    (Taken during High moon transit)

    CCD

    QHY9S MONO CCD
    Ha 1200s x 18
    SII 1200s x 10
    OIII 1200s x 10
    Mount iOptron CEM60

    Filters

    Chroma Technology 3nm spectral line filters: H-alpha, OIII and SII

  • Terry Hancock
    The Heart and Fish Head Nebulae

    Image capture details

    Terry Hancock
    www.downunderobservatory.com

    Location

    GrandMesaObservatory.com
    Whitewater, Colorado

    Dates

    September 21, October 30, 2017

    RGB 64 x 4 min, H-Alpha 24 x 10 min
    Total Integration time 8.3 hours

    Camera

    QHY367C
    Gain 2850, Offset 76 with Dark Frames no Flat.

    Optics

    Walter Holloway’s Takahashi FSQ 130 APO
    Refractor @ F5

    EQ Mount

    Paramount ME

    Image Acquisition software

    Maxim DL5
    Registered, Calibrated and Stacked in Deep Sky Stacker
    Post Processed with Pixinsight and Photoshop CS6

    Filters

    Chroma Technology 3nm spectral line filters: H-alpha, OIII and SII

 

 

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27050

U-Bessell

UV photometric filter in UVBRI series - Durable, high-transmission sputtered coating

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  • 27103 - Bessell UBVRI
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27055

Sloan-u

UV photometric filter in Sloan ugriz series - Durable, high-transmission sputtered coating

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  • 27104 - Sloan ugriz
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27060

Classic U-Bessell

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  • 27105 - Classic UBVRI Set
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27052

B-Bessell

Blue photometric filter in UVBRI series - Durable, high-transmission sputtered coating

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  • 27103 - Bessell UBVRI
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27061

Classic B-Bessell

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27043

Blue

Blue filter for color rendering with RGB set

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  • 27102 - HaLRGB
  • 27101 - LRGB
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27056

Sloan-g

Green photometric filter in Sloan ugriz series - Durable, high-transmission sputtered coating

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  • 27104 - Sloan ugriz
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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.

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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.

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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

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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

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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

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27066

OIII 3nm Bandpass optimized for f/2.8-f/3.6

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. Chroma’s f/3.0 filters are designed to minimize spectral shift and hold their shape better in an f/3.0 beam.

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27051

V-Bessell

Green (Visible) photometric filter in UVBRI series - Durable, high-transmission sputtered coating

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  • 27103 - Bessell UBVRI
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27062

Classic V-Bessell

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  • 27105 - Classic UBVRI Set
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27042

Green

Green filter for color rendering with RGB set

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  • 27102 - HaLRGB
  • 27101 - LRGB
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27040

Lum

Luminance filter for enhancing color rendering with RGB set

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  • 27102 - HaLRGB
  • 27101 - LRGB
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27057

Sloan-r

Red photometric filter in Sloan ugriz series- Durable, high-transmission sputtered coating

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  • 27104 - Sloan ugriz
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27053

R-Bessell

Red photometric filter in UVBRI series - Durable, high-transmission sputtered coating

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This filter is also available as part of these complete filter sets
  • 27103 - Bessell UBVRI
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  • Optical Density
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  • Astronomy

27063

Classic R-Bessell

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  • 27105 - Classic UBVRI Set
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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).

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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).

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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).

Enter any notes or special instructions
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This filter is also available as part of these complete filter sets
  • 27102 - HaLRGB
  • Show:
  • Transmission
  • Optical Density
  • Overview
  • Astronomy

27065

H-alpha 3nm Bandpass optimized for f/2.8-f/3.6

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). Chroma’s f/3.0 filters are designed to minimize spectral shift and hold their shape better in an f/3.0 beam.

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  • Astronomy

27041

Red

Red filter for color rendering with RGB set

Enter any notes or special instructions
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This filter is also available as part of these complete filter sets
  • 27102 - HaLRGB
  • 27101 - LRGB
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