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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. 

Download Astronomy Brochure PDF

  • 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

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

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

This filter is also available as part of these complete filter sets
  • 27103 - Bessell UBVRI
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27051

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

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

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

27052

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

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

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

27053

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

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

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

27054

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

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

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