The Baader Planetarium LRGBC 65 mm Square CCD Filter Set conveys enhanced color separation and picture quality without irritating halos. Baader has made phenomenal CCD filters through an extensive coating-stack design and testing program. Baader has partnered together with the world's leading thin film coating manufacturer to make transmission curves that border on the ideal. Basically - Baader's LRGBC anti-reflection filters deliver enhanced pictures for your astro-imaging! Tragically, their obvious enhancements will probably cause numerous astro-imagers to re-take pictures of their favorite celestial objects. This set contains five square 65 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 65 mm square 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 almost 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. In this way, O-III is represented as it should be, a teal (blue-green) color, and H-Beta is captured solely in the blue. This novel level of separation is accomplished, alongside high transmission for both lines. Moreover, the Green and Red filter passbands almost touch, leaving just a sharp indent 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 convey a smooth and accurate 1/4 wavefront over the whole surface. Every filter is blocked and individually polished, not removed and cut out of 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 refined gear accessible today, guaranteeing high consistency for bandpass cutoffs, transmission, and out of band blocking. The anti-reflection coatings are evenly adjusted on both sides of the filters to reduce surface stresses and avoid substrate deformation. The ultra-hard ion beam deposition guarantees the coatings will never degrade from use or normal cleaning. Baader coats each LRGBC filter separately making the filters remained sealed at their coating edges for a long life without degradation. Though more expensive, 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 - 65mm Square LRGB Filters - UV/IR Cut L-Filter and Clear Filter|
|Manufacturer Part No||FLRGBC-SQ65|
|Filter size||65 mm|