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Home Accessories Diagonals Telescope Diagonals For Astronomy Baader T-2 Star Diagonal (Zeiss) Prism with BBHS Coating
This T-2 90 degree diagonal prism (BaK4 glass) has 35mm clear aperture, the prism made in accordance to Zeiss-norms, multi-coated, with a solid metal casing, both sides have T-2 connection threads, resulting in an extremely short adaptable design.
This T-2 90 degree diagonal prism (BaK4 glass) has 35mm clear aperture, the prism made in accordance to Zeiss-norms, multi-coated, with a solid metal casing, both sides have T-2 connection threads, resulting in an extremely short adaptable design. Iis not just the housing that is significantly better and the Zeiss norm prism far superior, also the planarity and the conformality of the prism faces are about 5x better than standard prisms. For serious planetary observation a quality prism provides the best possible solution with far less scatter than even the best dielectric mirrors and of course it is far easier to clean being coated optical glass.BBHS (hard silver) coatingWith the Baader BBHS coating a well trained eye absolutely does distinguish more and richer colour on planets such as Jupiter, Mars and even on the moon - especially in conjunction with APO refractors. Predominantly during observation of planetary objects or bright nebulae, even at very high magnification, the BBHS® recipe does intensify colour, especially in the red end of the spectrum. It is quite amazing for many people to learn how very sensitive the human eye really is far out into the UV and NIR - far beyond conventional belief (respectively conventional experience). This experience is not to be had with any sole dielectric or multilayer aluminium reflective coatings and - most noticeable - there is not any trace of haze or stray light as with many other coating systems. The brilliance of the BBHS silver when observing with outstanding optics is simply breathtaking.T2 systemFor the Telescope or focuser side simply ad any 1.25" or 2" nosepiece with T2 thread (FF023 or FF145).For the eyepiece side use any T2 to 1.25" adapter - see related ptoducts.SpecificationsWeight (kg) 0.17Optical Design Star Diagonal PrismInner Connection (lens sided) Thread, T-2 (M42 x 0,75)Inner Connection (eyepiece/-camera-sided) Thread, M34Outer Connection (eyepiece/-camera-sided) Thread, T-2 (M42 x 0,75)Reflection surface Sealed BBHS coatingAR-Coating Phantom Coating® GroupImage Orientation Erect image, Mirror invertedOptical tube length 38,5Clamping System no clampDeflection angle 90°Inner Diameter / Clear Aperture (mm) 34