Astronomik Filters UHC 2"

The Astronomik UHC filter is designed specifically for visual observation.

Using the Astronomik UHC filter enhances your viewing experience, allowing you to perceive more stars and finer details in deep-sky objects compared to filters offered by other manufacturers.

The Astronomik UHC (Ultra High Contrast) filter facilitates the transmission of nearly 100% of radiation from both O-III and H-beta lines. While the second window for the H-alpha line isn't intended for visual observation, it's crucial for electronic device use. This filter effectively eliminates bothersome scattered light from various wavelength sources, including local artificial light pollution, providing a clear view of gas nebulae and planetary nebulae with a significantly reduced sky background.

Primary Use:

The remarkable light transmission of Astronomik UHC filters enhances the viewing of deep-sky objects, even with small telescopes! The high transmission of optical glass filters ensures sufficient light for successful visual observations, starting from telescopes with a 2" (50mm) aperture. These filters are optimized for telescope focal lengths ranging from f/4 to f/15. Transmission losses and chromatic distortions, common with other filters, are only observed with Astronomik filters under extremely bright aperture ratios of 1:2 and higher. Another notable advantage of our Astronomik UHC filter is the exceptional optical quality of the filter glass, ensuring sharp star images similar to those seen with your astronomical instrument without any filter!

Guidance for Your Selection:

For beginners, we recommend starting with the Astronomik CLS filter. This filter effectively suppresses artificial light pollution and natural airglow, providing a dark-sky background and enabling longer exposure times to reveal fainter objects. The filter is optimized to reproduce objects in their natural colors. Note: The basic CLS filter lacks built-in IR-blocking, so opt for the CLS-CCD filter for astro-modified cameras!

For heavily light-polluted areas, the Astronomik UHC filter is an excellent choice. Its transmission curve selectively allows light from H-beta, OIII, H-alpha, and SII lines, providing superior background suppression compared to CLS. However, this filter primarily enhances the visibility of gas nebulae, filtering out star clusters and galaxies to a large extent.

For a deeper dive into astrophotography, consider the OIII, H-alpha, and SII emission line filters, available with a full width at half maximum of 6nm or 12nm. These filters enable detailed imaging of faint objects, even in locations with extreme light pollution or under a full Moon. Images captured in these narrow emission lines may not display natural colors.

For owners of astro-modified cameras, we offer the Astronomik OWB filter, designed to correct the altered color reproduction of converted cameras, allowing for normal everyday photography without extensive post-processing adjustments.

SPECIFICATIONS

Capacity:

Connection (to the telescope): 2"

Coating of Optical System: Multiple

Mount Material: Aluminium

Frame: 2"

Passband (nm): 480-505 & 645-700

Transmission: 97%

General:

Series: UHC

Type: Filters

Type of Build: UHC Filters

Area of Application:

Visually Useful: Yes

Useful for Photographs: Yes

Anti Light-Pollution: Yes