Astronomik Filters UHC M49 (65817)

This Ultra High Contrast (UHC) filter enhances the visibility of stars and deep-sky objects, offering superior performance compared to other manufacturers. It transmits nearly 100% of light from O-III and H-beta spectral lines while effectively blocking scattered light and artificial pollution. Although the H-alpha band is not designed for visual use, it is highly beneficial when used with imaging devices. By significantly reducing sky background brightness, the filter reveals intricate details in gas and planetary nebulae.

Exceptional Performance:
Astronomik UHC filters deliver outstanding results even with small telescopes starting at 2" (50mm) aperture. Their high transmission ensures enough light for successful observations, while their design is optimized for telescope focal ratios between f/4 and f/15. Unlike other filters, Astronomik UHC filters maintain sharp star images without chromatic distortion or transmission loss, except in extreme cases with focal ratios faster than f/2. The optical quality of the filter glass ensures pinpoint stars, as if no filter were used.

Durability and Versatility:
These filters are built to last, with coatings that resist scratches, aging, and humidity. They are parfocal with other Astronomik filters and maintain diffraction-limited accuracy, ensuring no reduction in your telescope’s optical performance.

Specifications:

• Passband: 480–505 nm & 645–700 nm
• Transmission: 97%
• Frame: M49 aluminium mount
• Coating: Multi-layered for durability
• Glass thickness: 1 mm

Applications:

• Visual Observing: Ideal for dark skies and urban environments; suitable for telescopes of all apertures.
• Astrophotography: Excellent for DSLR cameras (modified or unmodified) and CCD imaging with additional IR-block filters.
• Anti-Light Pollution: Effectively blocks unwanted wavelengths from artificial sources.

The Astronomik UHC filter is a versatile and reliable accessory that enhances both visual observation and astrophotography, making it an essential tool for amateur and professional astronomers alike.