Complete Full Frame 50x50 square LRGBC CCD filter set.
NO HALO'S - NO REFLECTIONS - NO GHOSTING
Baader's new LRGBC anti-reflection filters deliver vastly improved colour separation and image quality. Baader has partnered with the world's leading thin film coating company to produce transmission curves that border on the ideal. Their ultra steep cut-offs and high transmission (>95%) means that these filters can achieve something to a degree that no other RGB filter set can manage - they are able to effectively separate the important H-Beta and O-III lines.
The Blue filter passes virtually all of the H-Beta and O-III lines while the Green filter is able to capture all of the O-III line without intrusion into the H-Beta line. No light is wasted by either filter. Thus O-III is represented as it should be, a teal (blue-green) colour, and H-Beta is captured solely in the blue. Never before has this degree of separation been achieved, and with such high transmission of both lines. Additionally, Green and Red filter passbands nearly touch leaving only a sharp notch to block out the primary Mercury/Sodium light pollution line at 580nm. The high transmission everywhere else delivers the shortest combined exposures possible.
These filters also eliminate the annoying reflections present in other RGB sets via a careful balancing of the coating stacks. Each substrate is fine-optically polished plane parallel to deliver a smooth and accurate 1/4 wavefront over the entire surface. Each filter is blocked and polished individually, not cut out of a larger plate of glass. Coatings are professionally applied in Germany by the most sophisticated equipment available today, ensuring high consistency for bandpass cutoffs, transmission, and out of band blocking. The anti-
reflection coatings are evenly balanced on both sides of the filters to reduce surface stresses and prevent deformation of the substrates. The ultra-hard ionbeam deposition ensures the coatings will never degrade from use or normal cleaning.
Glass thickness 3mm
**special order item - please check with us for lead time**