The Baader Planetarium LRGB 50.4 mm Round CCD Filter Set conveys enhanced color separation and picture quality without irritating halos. Baader has made excellent CCD filters through an extensive coating-stack design and testing program. Baader has joined forces with the world's leading thin film coating manufacturer to create transmission curves that border on the ideal. Basically - Baader's LRGB anti-reflection filters deliver enhanced pictures for your astro-imaging! Unfortunately, their obvious improvements will probably cause many astro-imagers to re-take pictures of their favorite celestial objects. This set contains four round 50.4 mm unmounted filters: one each of red, green, blue colors, plus a UV/IR-Cut filter (luminance). Each of the LRGB 50.4 mm round filters are 3 mm thick.
Their ultra steep cutoffs and high transmission, >95% permits Baader to accomplish something no other RGB filter set has - they can adequately isolate the vital H-Beta and O-III lines. The Baader Blue filter passes virtually all of the H-Beta lines, while the Green filter is able to capture all of the O-III line, without infringing into the H-Beta line. None of the light is wasted by either filter. Along these lines, O-III is represented as it ought to be, a teal (blue-green) color, and H-Beta is caught exclusively in the blue. This novel degree of separation is achieved, along with high transmission for both lines. In addition, the Green and Red filter passbands nearly touch, leaving only a sharp notch to block out the primary Mercury/Sodium light pollution line at 580 nm. The high transmission everywhere else delivers the shortest combined exposures possible with every detector.
The high optical quality of the Baader narrowband filters ensures no loss in sharpness or contrast. Every substrate is fine-optically polished plane parallel to deliver a smooth and precise 1/4 wavefront over the whole surface. Every filter is blocked and individually polished, not removed from a bigger plate of glass. The special custom polishing operation sets Baader filters apart from other filter manufacturers.
Coatings are professionally applied to each Baader CCD filter by the most sophisticated equipment available today, guaranteeing 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 diminish surface stresses and prevent deformation of the substrates. The ultra-hard ion beam deposition guarantees the coatings will never degrade from use or typical cleaning. Baader individually coats each LRGB filter and they stay sealed at their coating edges for a long life without degradation. Though more costly, this procedure avoids coating failures resulting when filters are "biscuit cut" from bulk-coated sheet glass, leaving ragged edges for moisture to penetrate, and cause coatings to peel. Baader filters are intended for a lifetime of real-world use!
|Name||Baader Planetarium - 50.8mm Round LRGB Filters - UV/IR Cut L- Unmounted Filter|
|Manufacturer Part No||FLRGB-RD50|