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Hi Peter,
Another option for you to consider:
Why not pick up a cheap planetary cam like the ZWO ASI120 (currently $279 at Bintel but I've seen it on sale even cheaper) and give it a go on your 150mm Newt?
The back-focus won't be nearly so much of an issue as with a DSLR, it has a small sensor so should work fine with a 1.25" focuser & it weighs less than most eyepieces. Resolution is a function of aperture anyway so you'd probably get more planetary detail with the Newt than you would with a 100mm refractor.
It will help you learn what's required in terms of planetary photography (processing etc) & will do double duty as a guide camera for deep sky. You can then decide which direction you want to head equipment wise down the track.
Last edited by Retrograde; 31-10-2019 at 10:04 AM.
Reason: clarity
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