Chroma Archives - Modern Astronomy

Chroma – H-alpha 3nm Bandpass optimized for f/2.8-f/3.6 (2″)

Bernard Karpinski — Sun, 19 Apr 2026 11:45:24 +0000

Chroma – H-alpha 3nm Bandpass optimized for f/2.8-f/3.6 (2″)

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Chroma OIII 5nm Filter

Bernard Karpinski — Thu, 10 Dec 2020 16:14:12 +0000

The Chroma OIII 5nm Filter isolates the 500.7nm primary emission line of doubly ionized oxygen, which is the second most important imaging line after Ha.

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Chroma SII 5nm Filter

Bernard Karpinski — Thu, 10 Dec 2020 16:05:09 +0000

The Chroma SII 5nm Filter is essential for imaging objects rich in ionised Sulphur in light polluted areas and in moonlit conditions. Partners well with the Chroma 5nm Ha and OIII filters.

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Chroma H-Alpha 5nm Filter

Bernard Karpinski — Mon, 27 Aug 2018 17:30:36 +0000

Chroma H-Alpha 5nm Narrow Band Filter

The Chroma H-Alpha 5nm Filter is essential when imaging objects rich in ionised hydrogen, works well in light polluted areas and when the moon is up.

At 656.3nm, a narrow-band emission filter is required to separate H-Alpha from the SII doublet (671.6nm and 673.1nm).

Wavelength (CWL): 656

Bandwidth (FWHM): 5

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Chroma LRGB Filter Sets

c.rogers — Thu, 09 Jul 2015 20:13:14 +0000

All Chroma LRGB Filter Sets contains 4 x Individual Filters…

luminance
red
green
blue

Specifications

Durable sputter coatings
Filters designed for use with CCD and for f/4 or slower
Transmitted wavefront better than 0.25 waves/inch
Parallelism <30 arcsec
Thickness: 3.0 +/-0.05mm
Spectral performance has been improved for the Blue and Luminance filters.

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Chroma LoGlow Light Pollution Filter

c.rogers — Thu, 09 Jul 2015 19:36:10 +0000

Chroma LoGlow Light Pollution Filter

The Chroma LoGlow Light Pollution Filter provides balanced colour images while blocking most emission from metal-halide and vapor lamp sources

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Chroma Jovian Methane Filter

c.rogers — Thu, 09 Jul 2015 19:28:19 +0000

Chroma Jovian Methane Filter

The Chroma Jovian Methane Filter enhances contrast when imaging objects containing significant levels of methane, such as Jupiter.

Methane-rich components, such as those in the atmosphere of the Jovian planets, will appear darker.

Wavelength (CWL): 889

Bandwidth (FWHM): 18

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Chroma H-Alpha 8nm Filter

c.rogers — Thu, 09 Jul 2015 19:23:44 +0000

Chroma H-Alpha 8nm Narrow Band 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).

Wavelength (CWL): 656
Bandwidth (FWHM): 7.7
T: >=93%@656.3nmBW=7.7nm nominal

Please Contact Bernard at Modern Astronomy for Availability and Lead times.

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Chroma OIII 8nm Filter

c.rogers — Thu, 09 Jul 2015 19:15:11 +0000

Chroma OIII 8nm Narrow Band Filter

OIII 8nm Narrow Band filters isolate the doublet emission of doubly ionized Oxygen.

After ionized hydrogen, this is the next most common emission when imaging nebulae.

Doublet emission occurs at 495.9 and 500.7 nm.

Wavelength (CWL): 500

Bandwidth (FWHM): 7.1

T: >=92%@500.7nm, BW=7.1nm nominal

Please Contact Bernard at Modern Astronomy for Availability and Lead times.

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Chroma SII 8nm Filter

c.rogers — Thu, 09 Jul 2015 18:39:10 +0000

Chroma SII 8nm Narrow Band 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.

Wavelength (CWL): 672

Bandwidth (FWHM): 7.7

T: >=93%@672.4nm, BW=7.7nm nominal

Please Contact Bernard at Modern Astronomy for Availability and Lead times.

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