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Astronomik UHC-E 2" Filter
Filtre UHC-E
New product
Astronomik UHC-E 2" Filter
The Astronomik UHC-E 2" filter boosts contrast by blocking skyglow and light pollution. Works on all types of telescopes, and is recommended for instruments up to 125 mm. A great visual aid for emission nebulae under urban skies.
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Astronomik UHC-E 2" Filter
Description
The Astronomik UHC-E 2" filter is designed to improve visual observation of emission nebulae and comets under light-polluted skies. With a full width at half maximum (FWHM) of 45 nm, it blocks unwanted light from sodium and mercury vapor lamps and skyglow, while transmitting key wavelengths such as H-beta, OIII, and H-alpha.
This filter is compatible with all telescope types (refractors, reflectors, Maksutovs, SCTs), but is especially recommended for instruments up to 125 mm aperture, where it provides a well-balanced improvement in contrast without overly dimming the image. For larger telescopes, more selective filters like the UHC or CLS may be preferred.
It features a standard 2" M48 threaded cell compatible with most eyepieces and accessories, and is parfocal with other Astronomik filters, eliminating the need to refocus when changing filters.
Technical Specifications
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Filter type: UHC-E (Ultra High Contrast - Economy)
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Mount: 2" threaded (M48)
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FWHM: 45 nm
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Typical Transmission:
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H-beta (486 nm): 94%
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OIII (496/501 nm): 95%
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H-alpha (656 nm): 94%
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Transmission range: 465–530 nm and >645 nm
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Glass thickness: 1 mm
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Coating: MFR (scratch, humidity and age resistant)
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Parfocal: Yes, with other Astronomik filters
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Recommended use: Visual observation with telescopes up to 125 mm
Advantages
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Suitable for all telescope types (refractors, reflectors, SCTs)
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Great contrast improvement on emission nebulae
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High transmission of key wavelengths
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Perfect for beginners under light-polluted skies
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Durable and standard threaded mount
The Astronomik UHC-E 2" filter offers an affordable and effective solution for observing deep-sky objects in light-polluted areas. It enhances visibility of emission nebulae by blocking urban lighting and skyglow while preserving brightness. Compatible with all telescope designs, it is best suited for apertures up to 125 mm, striking a balance between contrast gain and overall image clarity.