Baader IR Pass Filter
The Baader IR Pass filter blocks wavelengths below 670 nm. At these longer wavelengths, planetary images are disturbed less by wavefront distortions in the atmosphere.
By combining a luminance image taken with the IR-Pass filter, along with RGB frames, overall image sharpness is significantly enhanced. Some of the world's best amateur planetary images have been taken with this technique.
The IR-Pass filter shares precisely the same exceptional features as other Baader filters.
High optical quality, Striae-free substrate, and high efficiency multicoatings result in the sharpest and highest contrast image possible.
Baader glass substrates are of true optical quality. The majority of filters are simply constructed from raw flame-polished, "optically flat", or occasionally a high quality commercially polished filter glass, this can result in wavefront deformations that damage image sharpness and contrast when used with telescopes.
Baader Planetarium filters are manufactured from striae-free substrates, and fine optically polished flat to within 1/4 wave p-v over the complete surface, plane parallel to within 30 seconds of arc.
This significant and exclusive custom step does add to the cost, however the end result is a filter that maintains the full wavefront quality of the scope without double images or ghosting, even when at high magnifications.
Compared with other filters, Baader Planetarium filters are designed to be stacked and combined. This is possible due to the high optical quality and highly efficient anti-reflection multicoatings.
The ability to combine filters opens up many exciting possibilities, permitting unique spectral characteristics unachievable with any single filter.
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