Astronomik UHC-E Filter - T-Mount

Astronomik UHC-E T-Mount Filter

Astronomik UHC-E filters make a great low-cost alternative for viewing deep sky emission nebulae and comets in severe light pollution. This filter is especially well-suited for smaller telescopes up to 5" (125 mm) in aperture. Blocks superfluous light such as that from street lamps, as well as skyglow, while enhancing emission nebulae and comet contrast.

A 45 nm FWHM (full width at half maximum) is provided by this Astronomik UHC-E filter. It highlights the contrast between your target object and the night sky, but less so than that of the UHC filter. However, the amount of starlight transmitted is larger. Thus the UHC-E filter is a better fit for smaller aperture telescopes.

Astronomik UHC-E Filter Highlights

• This Astronomik UHC-E T-Mount Filter is optimally suited for smaller instruments with up to 5" (125 mm) apertures

• Boosts contrast between deep sky emission nebulae and the skyglow background under heavily light polluted conditions

• Comet observation becomes possible when the UHC-E filter passes a spectral line of Carbon due to its high 45 nm FWHM

• 465 nm to 530 nm and 645 nm plus transmission range

• 1 mm thick glass

• Parfocal with all other Astronomik filters

• Complete protection from the impacts of scratching, aging, and high humidity is provided via multi-layer coatings

• This filter is diffraction limited and thus will not lessen the optical efficiency of your telescope

• Each Astronomik filter comes with a durable plastic storage case of superior quality

Transmission Specifications

• 94% transmission at 486 nm (H-beta)

• 95% transmission at 496 nm (OIII)

• 95% transmission at 501 nm (OIII)

• 90% transmission at 656 nm (H-alpha)

• Transmits from 465 nm to 530 nm as well as over 645 nm

• Blocks all undesirable wavelengths