OVL 1.25" Ultra High Contrast (UHC) Filter

OVL 1.25" Ultra High Contrast (UHC) Filter – 20195

The OVL 1.25" Ultra High Contrast (UHC) Filter is a high-performance narrowband nebula filter designed to improve visibility of faint deep-sky objects while reducing the effects of light pollution. Compatible with standard 1.25" eyepieces, it enhances contrast and reveals greater detail in emission and planetary nebulae, making it an essential accessory for visual astronomers.

Manufactured by OVL (Optical Vision Ltd), this filter is ideal for use with small to medium aperture telescopes and performs exceptionally well under suburban and moderately light-polluted skies.

Key Features

• 1.25" narrowband UHC nebula filter for visual astronomy

• Enhances contrast of emission and planetary nebulae

• Reduces light pollution and background skyglow

• Optimised for use with 1.25" eyepieces and accessories

• Effective with small and medium aperture telescopes

• Improves nebula visibility without excessive dimming

• Supplied with protective storage case

• Manufactured by OVL (Optical Vision Ltd)

Reveal More Detail in Nebulae

The OVL UHC filter improves visibility by transmitting key emission wavelengths while blocking unwanted artificial light and skyglow. This increases contrast and allows you to see delicate nebula structures more clearly.

It is particularly effective when observing popular deep-sky objects such as:

• Orion Nebula (M42)

• Lagoon Nebula (M8)

• Swan (Omega) Nebula (M17)

• Dumbbell Nebula (M27)

• Many other emission and planetary nebulae

This makes it an excellent all-purpose nebula filter for visual astronomy.

Optimised Narrowband Optical Performance

The filter selectively isolates important nebular emission lines, including:

• Oxygen-III (O-III) at 496nm and 501nm

• Hydrogen-Beta (H-β) at 486nm

This improves contrast, darkens background skies, and enhances visibility of faint structures without significantly reducing overall brightness.

Compared to stricter O-III filters, the UHC filter allows more light transmission, making it particularly effective with smaller aperture telescopes.

Compatible with Standard 1.25" Eyepieces

This filter threads directly onto standard 1.25" eyepieces and accessories, making it compatible with a wide range of telescopes, including:

• Refractor telescopes

• Newtonian reflectors

• Schmidt-Cassegrain telescopes

• Maksutov-Cassegrain telescopes

It provides improved deep-sky viewing performance across various telescope types.

Protective Storage Included

The filter is supplied in a protective storage case, helping to protect the optical surfaces from dust, scratches, and damage when not in use.

Technical Specifications

Ideal For

• Visual observation of emission and planetary nebulae

• Improving contrast under light-polluted skies

• Small to medium aperture telescopes

• Beginner and experienced astronomers

• Enhancing deep-sky observing performance

Why Choose the OVL 1.25" UHC Filter?

The OVL 1.25" Ultra High Contrast Filter is a highly effective accessory for improving nebula visibility and contrast. Its narrowband design enhances faint deep-sky objects while reducing light pollution, making it an excellent addition to any visual astronomy setup.