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Chroma LoGlow Filter

Chroma LoGlow Filter

by Chroma
SKU CT-27030-1.25M
CA$385.00 - CA$770.00
CA$385.00
CA$385.00 - CA$770.00
CA$385.00
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  • Blocks common spectral lines from metal-halide and vapor lamps
  • Designed for balanced color in broadband imaging
  • Designed for telescopes at f/4.0 and slower
  • 1.1 mm glass substrate
  • Not parfocal with standard 3.0 mm Chroma filters
  • Made in Vermont, USA with a lifetime warranty
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  • Description
  • FAQ
  • Specifications
  • In the Box
  • Warranty

  • Chroma LoGlow Filter

    The Chroma LoGlow Filter is a specialized light pollution suppression tool designed to keep balanced color in broadband astrophotography from light-polluted skies. By specifically targeting emission lines from common metal-halide and vapor lamps, this filter provides a cleaner background without creating dramatic color shifts. Built on a unique 1.1 mm glass substrate, it is designed for systems operating at f/4.0 or slower and comes in sizes from 1.25" mounted to 50 mm unmounted.

    Balanced Color Suppression: Blocking Sky Glow at f/4.0 and Slower

    Unlike narrowband filters that isolate single emission lines, the LoGlow filter is engineered for broadband targets like galaxies, reflection nebulae, and star clusters. Chroma designs it to block most emission from metal-halide and vapor lamp sources, which together contribute to sky glow, while giving balanced color across the visible spectrum. Chroma designs the LoGlow for systems with a focal ratio of f/4.0 or slower.

    The 1.1mm Substrate: A Critical Note on Focus

    The most significant design difference of the LoGlow filter is its 1.1 mm glass thickness. This is a deliberate departure from the 3.0 mm substrate used in Chroma's other astronomy filters. The direct consequence is that the LoGlow is not parfocal with its siblings; you will need to refocus your telescope when switching between the LoGlow and a standard 3.0 mm LRGB or narrowband filter.

    Sputtered Coatings on a Single Substrate

    Manufactured in Vermont, USA, every LoGlow filter benefits from Chroma's advanced sputtered hard coating process. The coatings are applied to a single substrate with no laminations. The primary filtering coating is applied to the front surface, while an anti-reflection coating on the rear surface maximizes transmission and prevents ghosting. The coatings withstand humidity changes and temperature extremes and stay spectrally accurate, and the filter is backed by a lifetime warranty.

    Sizes from 1.25" to 50mm Square

    The Chroma LoGlow is available in a comprehensive range of sizes to fit nearly any imaging setup. For filter wheels and sliders using smaller sensors, the 1.25" mounted filter with M28.5x0.6 threads is typically used. The 2" mounted (M48x0.75) and 36 mm unmounted sizes typically suit APS-C class sensors, and the 50 mm round unmounted size full-frame class sensors, depending on filter-to-sensor spacing and focal ratio. For the largest sensors, the 50 mm square unmounted filter gives the most coverage.

  • What kind of light pollution does the Chroma LoGlow filter block?

    The Chroma LoGlow is designed to block common spectral lines from artificial lighting sources, specifically metal-halide and vapor lamps (like sodium and mercury vapor). It selectively notches out these wavelengths while transmitting the rest of the visible spectrum, which helps to darken the sky background and improve contrast on broadband targets like galaxies and star clusters.

    Will I need to refocus when switching between the Chroma LoGlow and other Chroma filters?

    Yes, you will need to refocus. The LoGlow filter is made with 1.1 mm thick glass, while all other Chroma astronomy filters use a 3.0 mm substrate. This difference in thickness means the LoGlow is not parfocal with the rest of the Chroma astronomy line, requiring a focus adjustment when you switch filters.

    Is the Chroma LoGlow filter suitable for an f/2 telescope?

    No. Chroma designs the LoGlow for f/4.0 or slower. At very fast focal ratios like f/2, the steep light cone causes the filter's bandpass to shift towards blue wavelengths. This can move the filter's blocking bands away from the intended light pollution lines, reducing its effectiveness. For an f/2 system, you would need a filter specifically designed for that focal ratio.

    I'm imaging the Andromeda Galaxy (M31) from my suburban backyard. Is the LoGlow a good choice?

    Yes, this is an excellent application for the Chroma LoGlow filter. The Andromeda Galaxy (M31) is a broadband target, meaning it emits light across the entire visible spectrum. The LoGlow will help suppress the sky glow from your suburban location, increasing the contrast between the galaxy and the background sky while preserving the natural colors of its stars and dust lanes.

    How does the Chroma LoGlow affect color balance in my astrophotos?

    The LoGlow is designed to provide balanced color across the visible spectrum. By targeting only specific, narrow emission lines from artificial lights, it allows the majority of the continuous spectrum from stars and galaxies to pass through. This results in images that are easier to color balance during processing.

    Can I use the Chroma LoGlow filter for visual observing?

    While the filter is primarily designed for astrophotography, it can be used visually. It will help darken the sky background and may improve contrast on some objects, particularly from light-polluted areas. However, its effects will be more subtle to the eye than they are to a camera sensor during a long exposure.

  • Manufacturer Chroma Technology Corp (Vermont, USA)
    Chroma Part Number 27030
    Filter Type Light Pollution Suppression (Broadband)
    Glass Thickness 1.1 mm
    Parfocal No (Not parfocal with 3.0 mm Chroma filters)
    Recommended Focal Ratio f/4.0 or slower
    Sizes Offered 1.25" mounted, 2" mounted, 31 mm unmounted, 36 mm unmounted, 50 mm unmounted, 50x50 mm square
    Cell Threads (Mounted) 1.25": M28.5x0.6 male; 2": M48x0.75 male
    Coatings Durable sputtered hard coatings on a single substrate
    Anti-Reflection Yes, on rear surface
    Country of Origin Vermont, USA
    Warranty Chroma Lifetime Warranty

    • Chroma LoGlow Filter

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  • Chroma Technology Lifetime Warranty