The ED80 makes a terrific guidescope. It's a top little all round scope. There are so many options when you come to astrophotography. With the correct adapter and a webcam you an even guide with your existing long FL camera lenses. For example your 300 with a webcam would be ideal for guiding the Orion.
I really think you need to get up to Kulnura and have a look and a good chat. Its a huge area to start in and knowing what you want to do in terms of area of astrophotography (eg widefield) quickly determines the type of equipment best suited to what you want to do.
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