The Astronomik infrared (IR)-Block filter is the standard filter for lunar and planetary imaging with IR sensitive cameras, blocking IR-light while preserving the visible spectrum. By placing this filter in front of your camera, you can eliminate problems such as halos around objects and achieve a sharper overall image. The Astronomik IR-Block filter effectively blocks IR-light across all focal ratios.Blocking IR-light prevents ghost images. Optical systems typically corrected for the visible spectrum can have different focal points for visible and IR-light, resulting in a blurred ghost image in addition to the intended image. Since many cameras for imaging solar system objects are sensitive to IR-light, blocking it is critical to prevent this ghosting effect.
Additionally, the Astronomik IR-Block filter acts as protection against dust particles and airborne contaminants for telescopes and cameras. Other usesIt is an alternative to the Astronomik UV-IR Block filter if your camera has low sensitivity to UV-light.AlternativesUse the Astronomik UV-IR Block filter if your camera has high sensitivity to UV-light.Suitability of the Astronomik IR-Block filtersVisual observation: Suitable for dust protection onlyWebcam and video (planets): Very goodTechnical dataSuitable for all focal ratiosTypical transmission: 97-99% Glass thickness: 1mm (except Astronomik OWB Type 3 and XT filters)Finely polished optical glass, free of any striae, residual stresses, and bubblesExtremely scratch-resistant and durable coatingCompletely resistant against high humidity and aging effectsAstronomik MFR coating (Astronomik Deep-Sky RGB, UV-IR Block L-1, L-2, L-3, and Narrowband-Emissionline filters)Parfocal with other Astronomik filtersDiffraction-limitedOptimized spectral windowsDelivered in a high-quality, long-lasting filter boxDue to the high-precision machining of the carrier substrate, all Astronomik filters are parfocal with wedge errors far below all common tolerances. Astronomik filters are diffraction-limited, ensuring that the optical performance (resolution and contrast) of your telescope is not compromised. Issues concerning focal distances and the exact alignment of images from each color channel are therefore effectively eliminated. All Astronomik filters are ideal for modern cameras, including both CMOS- and CCD-based models, ensuring you capture the best possible images with your equipment. Sharpness, contrast, and the absence of any reflections and halos are guaranteed. Even with bright stars in the field of view, nebulae and galaxies will be captured with the finest structures. The Astronomik MFR coating is designed for optimal performance across a wide range of focal ratios of the optics used.Every Astronomik filter undergoes a rigorous quality control process before delivery. Additionally, each Astronomik Narrowband-Emissionline filter is measured using a high-end PerkinElmer Spectrophotometer to ensure it meets the specifications published on our website. On the back of each Narrowband-Emissionline filter box, you will find a label detailing the precise spectral data for that specific filter, including the maximum transmission and the recommended range of focal ratios.