Baader 36 mm CMOS Optimized LRGB Filter Set

Baader 36 mm CMOS Optimized LRGB Filter Set

Compatible with a wide range of telescope focal ratios, from f/15 to f/1.8, this Baader 36 mm LRGB Filter Set is enhanced for modern CMOS camera technology. RGB color filter contrast is maximized to correspond with typical CMOS quantum efficiency and s/n ratio, while stray light and reflections are both substantially reduced to a level previously unheard-of thanks to extremely high transmission on all three RGB color channels made possible by extremely steep slopes on all RGB transmission curves. All around blackened lens edges with telescope-sided black outer rim serving as a filter-lead-side-indicator help to further minimize undesirable reflections. Finally, for automated imaging applications with most telescope systems, a balanced design enables coveted 1:1:1 exposure times.

Enjoy 98% transmittance for emissions within the visual spectrum (420 nm to 685 nm) along with the simultaneous complete restriction of any UV or IR light on the outskirts of this range with the CMOS optimized Luminance “L” filter from the Baader LRGB filter set. This includes potentially damaging thermal radiation in the infrared. Astrophotographers using red-sensitive digital, CCD, or CMOS cameras will greatly appreciate the sharper star images they are able to obtain thanks to this filter.

Contrary to filters produced by other manufacturers which are cut from a larger plate of glass causing them to form micro-cracks around all edges, these 36 mm Baader LRGB color filters are individually coated and planeoptically polished with Reflex-Blocker™ hard coatings. This prevents premature aging via moisture build-up. In addition, these filters feature Baader Planetarium's own even harder Life-Coat™ coatings that will keep your filters from acquiring damage caused by unfriendly environmental conditions. With Life-Coat™, your filters boast the durability necessary to hold up over many years despite repeated proper cleanings. Designed with notable regard for parfocality, these filters conform to current standards in terms of thickness.

Baader CMOS Optimized LRGB Filter Set Highlights

• These 36 mm LRGB (Luminance/Red/Green/Blue) Bandpass Filters from Baader Planetarium are CMOS camera optimized and work with telescopes ranging from the very slow (f/15) to the very fast (f/1.8).

• In order to severely limit stray light and reflections, the color channel of each respective RGB filter provides extremely high transmission.

• Take matching 1:1:1 subframe exposures, especially crucial when it comes to automated imaging, thanks to a balanced design.

• Steep slopes at all transmission curves give all three color channels a nice contrast boost.

• Reflex-Blocker™ hard coatings and Life-Coat™ sealed coating edges are applied to each individual Baader RGB filter and not to a larger glass plate from which the filters are cut out.

• Each filter in this set is parfocal and matches existing filter thickness standards.

• All-around blackened edges and a black outer rim on the telescope side serving as a filter-lead-side-indicator limits reflections even more by assuring that no excess light falls onto the edge.

• Luminance "L" filters allow up to 98% transmission of visible light (420 to 685 nm) while completely cutting off any emissions from the UV or IR ends of the spectrum, including dangerous thermal radiation in the infrared.

• With the "L" filter, images of stars produced by digital, CMOS, and CCD cameras sensitive to red appear sharper.

• Achieve optimal deep sky S/N output via the ultimate peak transmission provided by the double O-III line energy you get from the joint use of the “B” and “G” filters.

• Simultaneously suppress infrared and near infrared emissions from 680 nm up to 1200 nm, while enhancing light from H-Alpha and SII emitting objects with the "R" filter.

• The impediment of annoying Mercury and Sodium vapor street lights emitting at 580 nm by both the "G" and "R" filters allows for a darker sky background and unmatched color balance and separation.

• Although optimized for CMOS cameras, these filters work just as well with older CCD cameras.

About the Luminance "L" Filter

The obstruction of UV and IR light originating from the extreme non-visible ends of the spectrum is the main purpose of the Baader Luminance "L" Filter. This includes complete blockage of damaging thermal radiation in the infrared, as well as the prevention of blurry stars when working with digital or CCD/CMOS red-sensitive cameras. Meanwhile, all visible spectral areas between 420 nm and 685 nm are allowed to pass at a 98% transmission rate.

About the Red "R" Filter

With the Red "R" Filter, only transmissions from 595 nm to 690 nm wavelengths are permitted to pass, including those of deep sky objects in the H-Alpha line. While there is an intentional overlap between the "G" and "B" filters in terms of spectral emissions allowed to pass, a purposeful gap between the shortest part of the "R" region and the longest part of the "G" region results in the exclusion of a wide range of unwanted light emissions from street lamps and other terrestrial sources. Red "R" filters fully obstruct the NIR and IR from 680 nm up to 1200 nm while keeping maximum transmission of H-Alpha and SII emissions extremely high.

About the Green "G" Filter

Best suited for imaging O-III emission line objects using CMOS monochrome cameras, Green "G" filters transmit wavelengths between 490 nm and 580 nm. Despite the previously mentioned "G" and "B" filter overlap, the crucial H-Beta and O-III emission lines are clearly independent from one another. Although there are no critically important emission lines to be found in the vicinity of 580 nm, Mercury and Sodium vapor street lights do emit from this region. However, thanks to Baader's RGB filter design, these unfavorable emissions are cut off almost entirely, resulting in a darker sky background as well as better color balance and separation.

About the Blue "B" Filter

Of the three Baader RGB filters, The Blue "B" Filter allows the transmittance of the shortest wavelengths (400 nm to 510 nm). This is especially useful for applications involving objects emitting from the H-Beta line (486 nm) such as the Horsehead nebula. Like the "G" filter, the "B" filter also passes O-III emissions (501 nm). When used in combination, these two filters provide double the O-III line energy for unmatched deep sky S/N via extremely high peak transmission.