There are a number of ways to setup Gav. In the first photo I'm setup to image through the 8" and the 300D and autoguide using a ToUcam and laptop through the 80. Alternatively I could image through the 80 with the 300D and autoguide or manually guide through the 8".
This over/under setup is the most common. If however your weight is pushing the mount limit you can opt for a side/side mounting setup. It's harder to balance but keeps the weight nearer the mount head (second photo).
You could also have your DSLR in place of the 80 in the first photo or one of the refractors in the second. You basically mix and match to suit your needs.
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