Omegon Premium Moon filter 13% transmission 2″
The Moon is one of the most popular objects in the sky for both beginner and experienced astronomers - but also one of the brightest. Looking through a telescope without a filter, its glare can be genuinely uncomfortable: your eye tires quickly and fine surface details get lost in the overexposed light. The Omegon Premium Moon filter with just 13% transmission solves this problem elegantly. It is a classic neutral density filter designed specifically for visual lunar observation - taming excess brightness and revealing details that would otherwise remain hidden.
How the filter works
A neutral grey (ND) filter works on a simple principle: it attenuates light evenly across the entire visible spectrum without affecting the colour rendering of the observed object. A transmission value of 13% means that only 13% of incoming light passes through the filter - roughly a sevenfold reduction in brightness compared to an unfiltered view.
This makes it ideal for medium to larger telescopes (approximately from 100 mm objective diameter), where the Moon appears at its brightest and most detailed. The result is significantly more comfortable observation - your eye is no longer overloaded, and your brain can calmly process the details of craters, mountain ranges, maria and other lunar features.
Design and compatibility
The Omegon Premium Moon filter in 2″ size is mounted in a precision-machined aluminium frame that combines low weight with durability. The thread matches the standard 2″ format, so installation is straightforward - the filter simply screws into the barrel of a standard 2″ eyepiece or a 2″ adapter. No special adapters or tools are required. The aluminium construction prevents corrosion and ensures a long service life under regular astronomical use.
When and how to use it
This filter is intended primarily for visual lunar observation - it is not optimised for astrophotography, as more specific solutions exist for that purpose. For visual use, however, it brings tremendous comfort: you can spend far longer at the eyepiece without eye fatigue, perceive greater contrast between illuminated and shadowed areas, and notice finer morphological details.
It is particularly well suited for observing the full Moon or near-full Moon, when lunar brightness is at its peak. Note that for smaller telescopes (below 80 mm aperture), 13% transmission may be somewhat too aggressive - in those cases a filter with higher transmission around 25% is usually more appropriate.
Key features at a glance
- Transmission: 13%
- Filter type: neutral density (ND), grey
- Barrel size: 2″ (standard thread)
- Frame material: aluminium
- Intended use: visual observation of the Moon
- Recommended telescope aperture: approx. 100 mm and above
Technical parameters
| Parameter |
Value |
| Transmission |
13% |
| Filter type |
Neutral density (ND) |
| Barrel size |
2″ |
| Frame material |
Aluminium |
| Recommended aperture |
From approx. 100 mm |
| Intended use |
Visual lunar observation |
About the Omegon brand
Omegon is a well-regarded astronomical brand with a wide product portfolio - from telescopes and mounts to filters, eyepieces and accessories. Its products are designed with a focus on accessibility for a broad audience, without compromising on optical and mechanical quality. The Omegon Premium filter series is a popular choice among astronomers looking for a reliable and functional solution at a reasonable price - exactly what you would expect from a quality lunar filter.
Is this your first lunar filter?
The Omegon Premium Moon 13% is a reliable and affordable accessory for anyone who wants to get the most out of lunar observation. Its straightforward construction, standard 2″ connection and proven transmission value make it an ideal choice as your first lunar filter - as well as a constant companion for the more experienced observer.
