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"I have a Rubinar 500mm f8 mirror lens which was surprisingly well corrected, though I found some interesting reflections (which may have been due to the lens or maybe filter). "
Wow! apart from the donuts that's not bad!
No disrespect to the 400d - i loved mine back in the day - but i reckon mating that lens with a dedicated astrocam could yield some good results!
There is hope yet!
Thanks Richard!
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