Baader IR-Pass 31,8mm filter

Baader IR-Pass filter starts at 670nm in the deep red (normal spectral bandwidth is 400-700nm), just in the visual range so it can be focussed correctly. At this long-wavelength spectral range the atmospheric air turbulence (seeing) has much lower impact on the sharpness. Dark structures on Mars, Jupiter, the Moon and the Sun are thereby rendered much sharper. The luminosity can then be combined with RGB creating a very sharp LRGB image.