The rain has gone, the sky is clear and all looks set for a full night of stargazing. It is always a good sign when the skies clear after some substantial rain. It usually means the air has be cleaned of that interfering dust and gives best chance of dark skies. Tonight I will try my EOS filter which fits inside the Canon DSLR. The features of this filter are to reduce light pollution which comes from things like sodium street lighting, sky glow and moon glow. It does this by filtering frequencies associated with these solution effects, most notably Sodium lighting (orange colour).
For the moon I have to reduce the iris in front of the objective lens otherwise it will be much too bright.
This also changes the focal ratio from F12 to F22 which is good for a lunar/planetary object. Quite a surprise it has given the image is nice and sharp but it is tinted blue! Now in hindsight that is to be expected as the filter is designed to remove light pollution as well a moon glow!
For the rest of this evenings viewing click here:A-full-night-of-stargazing
