Baader 2" CMOS Optimized UV/IR Cut Luminance Filter

Baader 2" CMOS Optimized Luminance "L" Filter

Designed with the blockage of imperceptible UV and IR light as their central objective, Baader Luminance “L” filters are able to cut off potentially injurious infrared thermal radiation while maintaining 98% transmission for any visible light emissions (420 nm to 685 nm). Furthermore, for imagers using red-sensitive digital, CCD, or CMOS camera models, this filter will keep stars from appearing too blurry.

Baader 2" CMOS Optimized Luminance "L" Filter Highlights

• Suitable for use with a large array of telescopes, including those featuring focal ratios between f/15 and f/1.8, this Baader 2" Luminance "L" Bandpass Filter is optimized for CMOS imaging cameras.

• Enables the passage of up to 98% of emissions originating from visible spectra between 420 nm and 685 nm.

• Provides total blockage of UV and IR emissions, as well as damaging thermal radiation in the IR.

• Using this filter with red-sensitive digital and CMOS/CCD cameras makes stars seem a lot less blurry.

• Separately coated rather than carved out of a larger glass plate, this Baader LRGB filter has been planeoptically polished with Reflex-Blocker™ hard coatings and Life-Coat™ sealed coating edges.

• This parfocal filter meets the current standards for filter thickness.

• The entire circumference contains blackened edges with black outer rim on the telescope side that acts as a filter-lead-side-indicator to prevent reflections resulting from light emissions spilling onto the edge of the filter.

• Works with older CCD cameras despite being designed specifically with modern CMOS technology in mind.

More about Baader CMOS Optimized LRGB Filters

Astro-imaging with modern CMOS cameras using Baader LRGB color filters is achievable for nearly all telescopes independent of optical speed. In fact, these filters are compatible with any telescope that has a focal ratio between f/15 and f/1.8. Notable features include a balanced design, steep slopes at all transmission curves, blackened lens edges with telescope-sided black outer rim around the entire circumference. Highly coveted 1:1:1 subframe exposures, a must for automated imaging, are realized due to this filter's balanced design. Remarkably low levels of stray light and reflections, as well as peak color contrast that matches regular CMOS QE and s/n ratio, are both attainable through steep transmission curve slopes. Finally, unwanted reflections are lessened even further thanks to blackened lens edges with black outer rim on the telescope side that serve as a filter-lead-side-indicator.

In addition to the RGB color filters, this CMOS optimized set also contains a Luminance “L” Filter that serves to completely block both UV and IR emissions while allowing visible light between 420 nm and 685 nm to pass through up to 98% of the time. Typically, when imagers use red-sensitive digital, CCD, or CMOS cameras for stellar astrophotography, they expect their results to have blurry stars. The “L” filter prevents this altogether. Rejects hazardous infrared thermal radiation as well.

For cheaper filters made by other manufacturers, one of the main causes of premature aging is the moisture accumulation stemming from micro-cracks formed around all edges. These micro-cracks develop as a result of being cut from a larger plate instead of individually coated and planeoptically polished with Reflex-Blocker™ hard coatings and Life-Coat™ sealed coating edges like Baader’s CMOS Optimized LRGB Filters. Furthermore, because Reflex-Blocker™ coatings are resistant to scratching, the quality of these filters will remain high indefinitely regardless of cleaning frequency. Lastly, current standards for filter thickness are met with these parfocal filters.