Baader UV/Infra Red Blocking Filter 1.25" and 2" The only infrared blocker in this price range featuring a planeoptically polished substrate, parallel to within 30 seconds of arc!

In combination with the unique properties of the BAADER Contrast-Booster the resulting spectral window eliminates all known effects of image deterioration – an absolute MUST for digital imaging.

Filter Properties:

*Reflects destructive heat radiation!

*Protects your valuable solar observing equipment such as DAYSTAR-Filters and the like from excessive heat-stress.

*Stays cool and will not shatter if subjected to great thermal stress, since even intensive radiation is not absorbed – as with ordinary `heat protective Filters`, such as KG-3 or KG-5. Energy is reflected due to an elaborate interference system of 39 dielectric coating layers.

*98% Transmission average across the visible spectrum.

*Enables pinpoint star images with digital and CCD-equipment.

*Ultrahard and durable Ion-Beam IR-cut coatings, may be cleaned any time without worry.

*Hard and absolutely scratch resistant 7 layer-multicoat featuring 0.3 % residual reflection versus the regular 4.6% of an uncoated substrate.

*Freedom from ghost images due to highest quality Coatings.

*Planeoptically polished! Retains full image resolution even at highest magnification during solar observation or eyepiece projection.

*Incredibly low priced.

*Full family of adapters to mount in Full family of adapters to mount in (almost) any telescopes optical train – see the Astro T-2 System.

*Larger clear aperture than any competing 31.7mm or 50.8mm filter.

*Better, more elaborate filter cell design than any competing filter, featuring a CNC milled `crown` for ease of handling and attachment.