Astronomik UHC-E Clip-Filter EOS APS-C – Perfect for Deep-Sky & Comets
The Astronomik UHC-E Clip-Filter is a cost-effective option for deep-sky and comet observations under light-polluted skies, ideal for smaller telescopes.
The UHC-E filter boosts contrast for emission nebulae and comets while blocking streetlight pollution and airglow, making it highly effective for telescopes up to 5" (125mm) in aperture.
Main Use
This filter offers a full width at half maximum (FWHM) of 45nm, effectively blocking sodium and mercury vapor streetlights and enhancing the contrast between celestial objects and the night sky. While the contrast is slightly less compared to the Astronomik UHC filter, the UHC-E allows for more starlight, making it better suited for smaller telescopes. The filter also passes a carbon spectral line, allowing comet observation.
Other Uses
- Observation of Jupiter’s clouds
- Easier resolution of double stars
- DSLR and camera photography under light-polluted skies
Alternatives
If you use a telescope larger than 5", the Astronomik UHC filter offers greater contrast. For telescopes over 8", the OIII filter provides even better results when observing certain nebulae.
Suitability
- Visual observation (dark skies): Reasonable, UHC filter is better
- Visual observation (urban skies): Good, suitable for telescopes up to 125mm
- Film photography: Good, but requires long exposure times
- CCD photography: Good with an additional IR-block-filter
- DSLR photography (astro modified): Excellent color balance
- Webcam/Video (Deep Sky): Very good for light-polluted areas
Technical Data
- 94% transmission at 486nm (H-beta)
- 95% transmission at 496nm and 501nm (OIII)
- 94% transmission at 656nm (H-alpha)
- Transmission range: 465nm–530nm and above 645nm
- Full width at half maximum: 45nm
- Parfocal with other Astronomik filters
- Glass thickness: 1mm
- Highly resistant to humidity, scratches, and aging
- Diffraction-limited: Does not reduce the optical performance of your telescope
- Comes in a high-quality, durable filter box
- New design since 2008 to eliminate halos and reflections
