I know people have used the Star Adventurer with lightweight scopes like the Red/Spacecat. While you can automate anything with an arduino and a stepper such as your EQ3, you will be ultimately limited by the platform you're running and its stability. At 50mm though I can't imagine there would be much of an issue. I think you can also improve sideral motor by adding a regulated power supply of you wanted to go that route. Too bad there is no push to EQ4.
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