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Bandmate™ filters yield bright, sharp and contrasty images - even in the optically sensitive position in front of the diagonal. Optical glass and red filtering allows for sharp and bright views of nebulae with embedded star clusters - such as the Lagoon Nebula (M8).Bandmate™ NebuStar™ Filter High-performance, dielectric, squarewave ”UHC” type general purpose narrow-band filter great for all nebulae types and instrument sizes. * Red blocking allows brighter, sharper star images not plagued with red fringing seen on most filters of this type. * Highest transmission in critical bands * Optical quality ground and polished BK-7 substrate means no loss of sharpness - even when used in front of mirror diagonals. 100% quality control: * Every single filter is checked optically and cosmetically to assure performance. * Every filter is individually serialized. Features of TeleVue Bandmate™ Filters * Optical grade BK7 glass to insure no image degradation due to the substrate. * Ion beam deposition of the coatings produces hard, stable coatings to reduce changes due to temperature and humidity. * Dielectric filter for high transmission and blocking of unwanted wavelengths provide high contrast images. * Aluminum filter cells precision machined and laser etched. |