This filter blocks wavelengths below 685 nm.
At longer wavelengths, planetary images are less disturbed by wavefront distortions in the atmosphere (seeing).
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.
Even more effective IR pass filters are made by Astronomik.
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