Here is another version. Nowhere near as good as yours, not least because the limb was drifting out of the FOV, but I find it really quite remarkable because it was taken with an iPhone pointed at a 25mm eyepiece of a 25cm aperture 1200cm FL undriven reflector. Took two people acting in concert, a friend holding his phone to the eyepiece and taking the exposure and me driving the focus on the phone when the camera was pointing in the right direction. It’s sufficiently encouraging that perhaps I’ll get a proper phone holding gizmo.
Hand-holding a phone can be mighty frustrating. I tried it for a while and obtained a few decent shot but mostly not.
So I invested in an Altair Universal Cell Phone Adapter which makes it very much easier. A bit pricey – but better than the cheaper versions (yes, I tried those too!). Here’s an example of the result with a Samsung Galaxy S5 phone.