Astronomik UHC 1.25" Light Pollution Filter

Description

Astronomik UHC
1.25"
Light Pollution Filter Made in Germany
From the manufacturer:
Suitability
Visual observation (dark skies): Very good, for telescopes of all apertures and high exit pupil
Visual observation (urban skies): Very good, for telescops from 100 mm aperture
Film photography: Reasonable, but very long exposure time
CCD photography: Good, when used with an additional IR-block-filter
DSLR photography (original): Good, colour balance shifted but contrast enhanced
DSLR photography (astro modified): Very good, colour balance is near perfect
DSLR photography (MC modified): Good, when used with an additional IR-block-filter
Webcam / Video (Planets): Unsuitable
Webcam / Video (Deep Sky): Good, if light pollution is a big problem
Technical Data
typ. 95% transmission at 486nm (H-beta)
typ. 95% transmission at 496nm (OIII)
typ. 95% transmission at 501nm (OIII)
typ. 95% transmission at 656nm (H alpha)
optimum position of transmission for telescopes with focal ratios from f/10 to f/3,5
Entire Blocking of annoying wavelengths
Ideal All-round Deep Sky filter even for small telescopes
Not sensitive to humidity or aging
Scratch-resistant!
Excellent carrier material. The optical performance of your telescope is not reduced by the filter in any way.
Parfocal with other Astronomik filters
Glass thickness: 1mm
Completely resistant against high humidity, scratches and aging effects
Diffraction limited, the filter will not reduce the optical performance of your telescope!
Astronomik filters are delivered in a high-quality, long lasting, filter box