Baader Planetarium 1.25″ IR-Pass 685nm Filter #2458385 (Planetary Imaging)


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Baader IR-Pass 685nm Filter

Dramatically enhances contrast when used instead of a luminance filter

– Baader IR-Pass Filer HWB 685nm
– Reduces the effect of seeing resulting in a much sharper image.
– Tip for use: Ideal for imaging and used for the luminosity channel.
– The effect of use: The normal spectral bandwidth is 400-700nm. This filter starts at 670nm in the deep red, 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.
– Highly recommended for any planetary imager.
– Reflex free anti-reflective and optically polished..

This product has been reviewed.

The Baader 685 nm filter has a well-deserved reputation for mitigating the effects of poor seeing when doing Lunar imaging. This year (2018) it proved its worth by permitting the imaging of Martian surface features, despite the veil of dust raised by the planet-wide storm. The 685 nm images stand alone or can be used, in combination with the very uninformative visible light views of the planet, to create interesting color images that mimic much of the detail of normal RGB images in the absence of the atmospheric dus (see attached image composite). The benefits of this filter can be realized with instruments of modest aperture.Ralph

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