I use a Nexstar 8SE OTA, usually mounted on my iOptron ZEQ25, equatorial mount. I just about always use my Meade F/6.3 Focal Reducer/Corrector. I never use a barlow, unless I am imaging the planets in which case I do use a 2X or 3X barlow, but that is for another topic on another forum.
You do not need to power your ASI294MC camera. The power is supplied by your laptop computer, if you plan on using a laptop. If you bought the ASI294MC Pro, then you would need power if you want to cool the camera, otherwise not powering it, it will work just like an ordinary 294MC un-cooled.
If you want to EAA observe galaxies, you do not use a filter. If you want to look at emission nebula or planetary nebula, use an Optolong L-eNhance filter. As you get deeper into the EAA rabbit hole, you might want to specialize into narrower filters like a pure Ha (Hydrogen Alpha) 7nm filter or OIII (Oxygen 3) 7nm filter. The Optolong L-eNhance filter is a dual filter, letting in both Ha and OIII, with a little bit of Hb (Hydrogen Beta) and a touch of NII (Nitrogen 2) or SII (Sulfur 2).
In my setup, I run with my F/6.3 reducer/corrector attached to the threads on the back of the scope. Next comes a 2" visual back and into the visual back, I insert my ZWO EFW (electronic filter wheel) that I can adjust when moving from object to object using the built in ASCOM software in SharpCap 3.2 Pro, and attached to the back end of the filter wheel is my ASI294MC camera or ASI183MM camera. My focuser uses the JMI Motofocus electronic focuser, that I run a long cable from to use the Motofocus at a distance.
Typically, in the cooler/cold weather, I sit in my SUV with my laptop on a custom laptop table attached the the floor. I then run the mount hand controller on a 25 foot 6p6C length of cable, a 16 foot audio cable that controls the focuser and a 16 foot USB 3.0 cable with a 4-port USB hub attached to the telescope. I plug in the filter wheel, my ASI294MC camera and my ASI290MM E-Finder into the 4 port hub. That USB 3.0 cable, the hand controller cable and the Audio cable from the Motofocuser are routed into my car window and connected to the laptop. I now have a semi-remote set up that I can enjoy in my car, with the heat on and the tunes playing, while I EAA observe/capture the objects that I want to see that night. I usually go out for 5+ hours at a time, sometimes staying out for 6 or more hours.
As you progress in your hunt for more elusive deep sky objects, you may want more aperture, I know I do as I will be soon buying a 14" Skywatcher Goto telescope. You may want to try out different cameras, I use a Celestron Neximage 5 (5 megapixel camera) to image the planets and for DSO's, I can use my ASI290MM, ASI294MC or my ASI183MM camera. I hope to be buying the ASI533MC camera soon.
So as you can see, it is a deep rabbit hole that you are getting yourself into, but the rewards are awesome if you keep your interest on high!
Edited by Stargazer3236, 12 April 2021 - 10:41 PM.