Astronomik UHC-E M52 (SKU: 10243086 / 8h00vm)

Astronomik UHC-E M52 (Astronomik, SKU: 10243086) is a filter for imaging emission nebulae and comets under light-polluted skies. Its wider passband than the UHC model retains more starlight while reducing unwanted background brightness. The M52 version screws into the front filter thread of a compatible lens.

Key features

• transmission of H-beta, OIII and H-alpha lines and emission bands useful for comet imaging
• less restrictive spectral selection than the UHC, transmitting more starlight
• no infrared blocking: a camera without its own IR-cut filter requires an additional IR-Block filter
• threaded cell for lenses with an M52 filter mount
• optically polished glass and durable coatings resistant to scratches and humidity

Included items

• one Astronomik filter in the specified version, SKU: 10243086
• protective storage box

Technical specifications

• manufacturer: Astronomik
• manufacturer SKU: 10243086
• filter type: UHC-E nebula filter for astrophotography
• transmission ranges: 465–530 nm and above 645 nm
• full width at half maximum (FWHM): 45 nm
• typical transmission: 94% at 486 nm (H-beta) and 656 nm (H-alpha); 95% at 496 nm and 501 nm (OIII)
• mounting thread: M52
• installation: in the filter thread in front of the lens
• front-of-lens limitation: the manufacturer advises against focal lengths below 50 mm in full-frame equivalent because of the risk of gradients
• glass thickness: 1 mm
• parfocality: with Astronomik filters with 1 mm glass thickness
• country of manufacture: Germany

The UHC-E increases the contrast of nebulae and comets without reducing starlight as strongly as narrower nebula filters.