Castell #29 Dark Red Planetary Filter 4% Transmission - 1.25"
Planetary Colour Filter #29 Dark Red 1.25-inch (4% transmission, M28.5x0.6).
This very dark red filter is recommended for large telescopes from 150 - 200mm and up.
Spectrogram of transmission of some colour filters; only for demonstration purposes.
|Weight in Kg||0.2|