Color filter red – 2″ – longpass filter 610nm – in a robust
storage box. Red filter with a steep absorption edge. Filters the
H-alpha line from the visible spectrum.
Blue and blue-green light is almost completely blocked, thereby
contrasts between the bright zones and the dark ones increase
bands on Jupiter and Saturn,
The most interesting filter for observing the polar caps of Mars and
optimal filter for daily observation of all planets.