Hi Andrew,
Whilst all of the above advise is good and sound, there is one factor not mentioned that may support your thoughts of the SE4 suiting your dual pursuits.
And that is, although it is on an Alt/Az mount, it does have a built in wedge, which converts it to Equatorial.
Additionally, it has a built in flip mirror which allows switching between eyepiece and camera.
However, 4 inches is a little small for most people when it comes to observing pleasure.
And f/13 is generally not well regarded by astro-photographers.
I just wanted to make sure you have all the facts before you discount it completely.
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