Astronomik IR-Cut 31,8mm filter

The IR-blocker is optimized for systems with focal ratios between f/0.5 and f/50. The typical transmission is higher than 99%.

Main use

The IR Blocker gives you a perfect parfocal filter. It blocks all IR light without modifying the visual part of the spectrum. It is also great as a dust protection for your telescope and camera.

Suitability

Visual observation (dark skies): It depends, for dust protection only
Visual observation (urban skies): It depends, for dust protection only
Film photography: It depends, for dust protection only
CCD photography: Very good, if used with optics which contain refracting elements
DSLR photography (original): It depends, for dust protection only
DSLR photography (astro modified): It depends, for dust protection only
DSLR photography (MC modified): Very good, if used with optics which contain refracting elements
Webcam / Video (Planets): Very good, if used with optics which contain refracting elements
Webcam / Video (Deep Sky): Very good, if used with optics which contain refracting elements

Technical Data

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
Since 2008 we do ship filters with a completely new design. Any kind of halo or strange reflection is a matter of past