Perhaps the UV-nikkor 105 mm f/4.5 would be better for that purpose, Øivind?
UV-Nikkor 105 and Df.
That fresh looking image certainly looks like it comes from a habitable planet. Mind you though that astro imaging stacks like the one I presented above involves extreme stretching to bring out the dark parts. That ghost was not visible in the unprocessed individual frames. Might have come from a light pollution source. The purple fringing is another matter though that many lenses have in common, but presumably not the UV nikkor, nor the 300 PF.
Edit: On second thought is there could have been some slight buildup of tiny ice crystals on the front element (no filter used) that has created the ghost.
