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Gooday Steve,
Welcome to Ice in Space, sounds like you have had some fun with astronomy over the years.
Regarding the Nexstar 5se, this scope is on an Alt/Az mount and therefore will limit your imaging time. Bright objects that require short exposure times will be OK, but anything over 30 secs will cause you grief with star trailing and field rotation. These issues can be overcome by throwing more money into the mix but why bother.
Do you have a tracking equatorial mount for the Vixen 150mm, an EQ mount is much better for long exposure imaging and the 150mm Vixen will produce good images.
Cheers
Bill
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