In the last 10 years, astrophotography has advanced hugely
 

On 18/09/2016 05:59, RichA wrote:
Never mind the Milky Way scenics, this is a "movie" of Mars (actually, dozens of finished shots compiled from tens of THOUSANDS of individual shots) taken with a 3900mm mirror-lens f/10 (probably acting at an effective focal length of around 20,000mm with additional optics).
The resolution of detail is on the order of 0.16 arc seconds (about twice as good as the lens is theoretically capable of) or 1/22500th of a degree. The planet's visual diameter is only about 23 arc seconds.

https://www.youtube.com/watch?v=v_SL...ature=youtu.be

Very impressive, Richard, thanks for posting.

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Cheers,
David
Web: http://www.satsignal.eu