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