Omegon Pro 1.25″ UHC filter

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Omegon Pro 1.25″ UHC Filter

Article No.: 47288
Manufactured by: Omegon
Shipping weight: 0.05 kg

Our price: 69.85 €

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This product is available in the following variants:
Omegon Pro 1.25″ UHC Filter	69.85 €
Omegon Pro 1.25″ CLS Filter	82.20 €
Omegon Pro 1.25″ H-Beta Filter	93.55 €
Omegon Pro 1.25″ OIII CCD Filter	140.55 €
Omegon Pro 1.25″ LRGB Filter Set	271.80 €

If you have ever stood under a starry sky and tried to make out the fine details of nebulae, you know exactly how much light pollution and poor background contrast can ruin the experience. The Omegon Pro UHC (Ultra High Contrast) filter is precisely the answer you have been looking for. It is no coincidence that this is the best-selling narrow-band nebula filter in its category - it combines a carefully designed optical layout with everyday practicality for any astronomical adventure.

How the UHC filter works

The principle of a UHC filter is based on selectively transmitting light only at the wavelengths where most emission nebulae actually shine. The Omegon Pro passes three key spectral lines:

Oxygen line O III - 500.7 nm
Hydrogen line H-beta - 486.1 nm
Hydrogen line H-alpha - 656.3 nm

Transmission at the O III and H-beta lines reaches nearly 100 %; transmission at the H-alpha line is 96 %. All other wavelengths - especially those produced by street lamps and industrial light sources - are effectively blocked. The result is a dramatic increase in contrast between the dark sky background and the nebula itself, even under skies affected by light pollution.

Construction and compatibility

The filter body is machined from aluminium, which ensures thread stability and protects the optics from mechanical damage. The 1.25″ thread matches the most widely used eyepiece standard, so the filter simply screws directly into your eyepiece with no adapters required. This product belongs to the Pro series, which within the Omegon range designates filters with a higher level of workmanship and more precise optical specifications.

What can you observe with this filter?

The Omegon Pro UHC filter is an ideal choice for observing emission and planetary nebulae, for example:

Orion Nebula (M42)
Ring Nebula (M57)
Dumbbell Nebula (M27)
Supernova remnants such as the Veil Nebula in Cygnus

Thanks to the high H-alpha transmission, it is also excellent for astrophotography, where it helps extend effective exposure time and pull out detail even from low-contrast areas of the frame. Both visually and photographically it is a genuinely versatile tool.

Key technical parameters

Parameter	Value
Filter type	UHC (Ultra High Contrast)
Barrel size	1.25″
Thread type	Standard 1.25″ eyepiece thread
O III transmission (500.7 nm)	~100 %
H-beta transmission (486.1 nm)	~100 %
H-alpha transmission (656.3 nm)	96 %
Body material	Aluminium
Use	Visual and photographic

Who is this filter for?

The Omegon Pro UHC 1.25″ filter is a reliable companion for anyone who wants to get the most out of their telescope when observing deep-sky objects - regardless of whether you observe from a dark rural site or from the suburbs of a large city. If you are looking for a single filter that covers what matters most in deep-sky observation, this is exactly it.