They pass the lines the gas emits and block the rest · review
A 1.25 in UHC filter from Omegon’s Pro range, sold on the contrast improvement it brings to nebula observing, with no wavelengths published.
The bottom line A filter sold entirely on the experience it promises, with no number anywhere to hold it to.
The listing describes an object glimmering faintly at the edge of visibility, and then the filter making it clear. That is an accurate account of what a UHC filter does on an emission nebula, and it is the whole of the technical content.
The wavelengths passed, and the transmission at each. Those two together define a filter completely, and this listing contains neither. One of the three UHC filters on this shelf publishes its lines; this is not that one.
It names a range within a catalogue. It is not a specification, it is not a standard, and it does not constrain the passband in any way.
On emission nebulae from a light-polluted site, it will raise contrast. On galaxies and clusters it will not, because they emit across the spectrum and so does the sky behind them. Nothing gets brighter under any filter.
German, French, Italian and Spanish Amazon stores ran from 63 € to 66 € on the day of the survey.
British Amazon store lists it in local currency, which the euro range above sets aside.
American Amazon catalogue holds a record for it that nobody is selling.
Figures as Keepa reported them on the day this page was last updated. Stock and pricing shift without warning.
Prices quoted in this text were read on 17 September 2026. The live price is at the top of the page.
| Bandpass and type | UHC — a market convention, not a published standard · The listing gives none: no wavelengths and no transmission percentage appear |
|---|---|
| Line transmission | Not published by the maker. |
| Blocking outside the band | Not published by the maker. |
| Thread size | 1.25 in |
| Glass flatness | Not published by the maker. |
| Coatings | Not published by the maker. |
| Amazon reference | B016O65QS4 (same reference on 6 Amazon marketplaces) |
| EAN | 4049467472889 |
It cannot be compared, which is the point. Without wavelengths there is no way to place two UHC filters against each other on paper, and the designation alone does not constrain what either passes.
On emission nebulae, yes — it removes far more artificial sky glow than nebula light. On galaxies and star clusters, which radiate across the spectrum, it removes both equally and gains nothing.
UHC · passes 486, 496, 501 and 656 nm · 1.25 in
A 1.25 in UHC filter that publishes the emission lines it passes: hydrogen at 486 and 656 nm and oxygen at 496 and 501 nm, blocking everything else.
Best for: An observer who wants to know what a filter passes before buying it
≈ £58 / €58
UHC · 1.25 in · double-sided multi-layer coating · no passband published
A 1.25 in UHC filter with a precision-polished substrate and double-sided multi-layer coating, sold for raising nebula contrast — with no wavelengths published.
Best for: A first nebula filter for a suburban sky, bought on price rather than on specification
≈ $28 / £24 / €31
114 mm mirror · 900 mm focal length · alt-azimuth mount
A 114/900 Newtonian on a simple alt-azimuth mount, supplied with three eyepieces, a 6x30 finder and a 1.5x erecting lens, recommended by the maker from age eight.
Best for: A family telescope where nobody wants to learn polar alignment
≈ £150 / €142
