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another thing to consider:
the way astrophotos are taken has also changed.
From film to DSLR to ... webcams-straight-into-computer!
And with the direction obviously going towards "webcam"-like cameras: they get better and better and need less and less long subs.
On the other hand: the storing computer needs more and more space.
Or/And: computers nowadays can actually manage to stack subs on the fly allowing for real-time video astronomy.
What does that mean for your new mount?
You won't have to calculate with heavy guidscopes, OAG or DSLR body.
The 4kg OTA plus 1kg of stuff is really all the mount would have to carry if you go down the webcam path.
If your subs are 30 seconds, you can even make do with a motorized Alt/Az mount.
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