The Baader Planetarium LRGBC CCD Filter Set conveys enhanced color separation and picture quality without annoying halos. Baader has made phenomenal CCD filters through an expansive coating-stack design and testing program. Baader has banded together with the world's leading thin film coating manufacturer to produce transmission curves that border on the ideal. Basically - Baader's LRGBC anti-reflection filters deliver enhanced pictures for your astro-imaging! Unfortunately their excellent changes will probably cause numerous astro-imagers to re-take pictures of their favorite celestrial objects. This set contains five round 50.4 mm unmounted filters: one each of red, green, and blue colors, plus a UV/IR-Cut filter (luminance), and one Clear precision-polished filter. Each of the LRGBC 50.4 mm filters are 3 mm thick.
Their ultra steep cutoffs and high transmission, >95% permits Baader to accomplish something no other RGB filterset has - they can adequately isolate the vital H-Beta and O-III lines. The Baader Blue filter passes essentially almost all of the H-Beta lines, while the Green filter can catch all the O-III line, without infringing into the H-Beta line. None of the light is wasted. Thus, O-III is presented as it ought to be, a teal (blue-green) color, and H-Beta is captured solely 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 nature of the Baader narrowband filters ensures no loss in sharpness or contrast. Every substrate is fine-optically polished plane parallel to convey a smooth and precise 1/4 wavefront over the whole surface. Every channel 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 implemented to each Baader CCD filter by the best gear available, guaranteeing high consistency for bandpass cutoffs, transmission, and out of band blocking. The anti-reflection coatings are uniformly balanced on both sides of the filters to diminish surface stresses and prevent substrate deformation. The ultra-hard ion beam deposition guarantees the coatings will never degrade from use or typical cleaning. Baader coats each LRGBC filter separately. Baader filters remain sealed at their coating edges for a long life without degradation. Though more costly, this process 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 - 50.4mm Round LRGBC Filters - UV/IR Cut L-Filter and Clear Filter|
|Manufacturer Part No||FLRGBC-RD50|