Omegon #80A 1.25″ colour filter, blue
If you want to get the most out of your telescope when observing planets, colour filters are one of the simplest and most effective tools to help you do that. The Omegon #80A blue colour filter for 1.25″ eyepieces belongs to the proven Basic series and offers solid optical performance at a reasonable price. The blue tint of the #80A filter increases the contrast of specific planetary details and is suitable for both visual observation and astrophotography.
Build quality and optical design
The filter is mounted in a robust aluminium threaded ring for the standard 1.25″ diameter, so it simply screws onto the bottom of virtually any eyepiece with this thread size. The optical glass features a multi-layer anti-reflection coating that minimises unwanted reflections and light loss at the filter surface - this is especially important when the filter only transmits part of the spectrum and every photon counts. The Omegon Basic series targets observers who are looking for functional and reliable accessories without paying a premium for top-tier branding.
What the #80A filter is best used for
The blue #80A filter performs best when observing Jupiter. It increases the visibility of atmospheric bands, cloud cover detail, and noticeably improves the contrast between dark equatorial belts and bright zones. The visually attentive observer will appreciate better readability of the fine structure of the Great Red Spot and the surrounding turbulence. The filter is also rated as suitable for photographic use - when doing planetary imaging with a CMOS or CCD camera, its selective transmission of the blue part of the spectrum helps to highlight specific layers of Jupiter's atmosphere.
Main applications
- Visual observation of Jupiter - enhanced contrast of atmospheric bands and zones
- Improved visibility of the Great Red Spot and surrounding turbulence
- Planetary astrophotography with CMOS or CCD cameras
- Selective transmission of the blue spectral component
What this filter is not designed for
Other applications - such as light pollution suppression, or observation of the Moon, Venus, Mars, Saturn or Uranus - are not covered by the #80A filter, and potential buyers should take this into account when making their choice. It is a specialised tool for a specific task, not a general-purpose filter.
About the Omegon Basic series
Omegon is a brand built with the needs of real astronomers in mind - from beginners to experienced observers. The Basic series products represent an entry point into the world of filter optics: they offer a standardised design, compatibility with most 1.25″ eyepieces, and multi-layer coatings that you would not expect to find in comparably priced alternatives. The Omegon #80A filter for planetary observation is a clear example of this approach - straightforward, effective, and precisely focused on its intended purpose. Omegon offers a wide range of astronomical accessories, so the #80A can be a first step towards building a complete set of colour filters for systematic planetary observation.
Technical specifications
| Parameter |
Value |
| Filter designation |
#80A |
| Colour |
Blue |
| Barrel diameter |
1.25″ |
| Frame material |
Aluminium |
| Optical coating |
Multi-layer anti-reflection |
| Recommended use |
Jupiter, planetary astrophotography |
| Compatible sensors |
CMOS, CCD |
| Series |
Omegon Basic |
