Product Description
OVL 2" Ultra High Contrast (UHC) Filter – 20197
The OVL 2" Ultra High Contrast (UHC) Filter is a highly effective narrowband nebula filter designed to enhance faint deep-sky objects while reducing the effects of light pollution. Compatible with 2" eyepieces and accessories, this filter dramatically improves contrast, allowing you to observe greater detail in emission and planetary nebulae—even under suburban or moderately light-polluted skies.
Manufactured by OVL (Optical Vision Ltd), this UHC filter is an essential upgrade for visual astronomers seeking clearer, higher-contrast views of deep-sky objects.
Key Features
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2" UHC narrowband nebula filter for visual astronomy
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Enhances contrast of emission and planetary nebulae
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Reduces light pollution and background skyglow
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Transmits key nebular wavelengths including O-III and H-Beta lines
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Ideal for use with 2" eyepieces and telescope accessories
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Effective with both small and large aperture telescopes
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Supplied in a protective storage case
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Manufactured by OVL (Optical Vision Ltd)
Reveal Faint Nebula Detail
The OVL UHC filter enhances visibility by selectively transmitting wavelengths emitted by nebulae while blocking unwanted artificial light. This improves contrast and reveals faint structures that would otherwise be difficult to detect.
It is particularly effective when observing:
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Orion Nebula (M42)
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Lagoon Nebula (M8)
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Swan (Omega) Nebula (M17)
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North America Nebula (NGC 7000)
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Many other emission and planetary nebulae
This makes it an excellent all-round nebula filter for deep-sky observation.
Narrowband Filtering for Improved Performance
The filter isolates key emission lines while suppressing background skyglow, including:
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Oxygen-III (O-III) at 496nm and 501nm
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Hydrogen-Beta (H-β) at 486nm
This targeted transmission increases contrast without excessively dimming the view, making it suitable for a wide range of telescope apertures.
Designed for 2" Eyepieces and Accessories
This filter easily threads onto standard 2" eyepieces, diagonals, and other compatible accessories, making it suitable for use with:
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Dobsonian telescopes
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Refractor telescopes
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Schmidt-Cassegrain telescopes
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Newtonian reflectors
It provides enhanced nebula viewing performance across many telescope types.
Protective Storage Included
Supplied with a durable protective storage case, the filter remains safe from dust, scratches, and damage when not in use.
Technical Specifications
| Specification | Details |
|---|---|
| Product Name | 2" Ultra High Contrast (UHC) Filter |
| Manufacturer | OVL (Optical Vision Ltd) |
| Filter Type | Narrowband Nebula Filter |
| Size | 2" |
| Key Transmission Lines | O-III (496nm, 501nm), H-Beta (486nm) |
| Compatibility | 2" eyepieces and accessories |
| Product Code | 20197 |
Ideal For
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Visual observation of emission and planetary nebulae
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Improving contrast under light-polluted skies
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Deep-sky observing with 2" eyepieces
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Beginner and experienced astronomers
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Enhancing nebula visibility and detail
Why Choose the OVL 2" UHC Filter?
The OVL 2" Ultra High Contrast Filter is an essential accessory for astronomers who want to reveal more detail in nebulae while reducing the effects of light pollution. Its narrowband performance, high optical quality, and compatibility with 2" eyepieces make it an excellent addition to any visual astronomy setup.
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