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Hi Nathan, Firstly, it is not a quirk. Until quite recently, most Newtonians
were like yours, not enough back focus for photography. Many buyers got
caught out by this fact. I have posted here many times over the years
suggesting that Newt buyers check with their retailer whether their
purchase was suitable for AP.
Your scope is especially unsuited for AP as it is not equatorially mounted,
and therefore cannot track accurately for more than about 15-20 seconds, as your elongated stars demonstrate.
It is also a longish tube attached to a single arm, which is not a very stable
arrangement for photography, where stability is paramount.
In short, the very mediocre results you will achieve will not justify the
effort involved in moving the primary mirror up further.
raymo
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