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Unguided, it depends on the focal length of the scope and PA. At 900mm focal length, my scope can only manage a minute with the HEQ5 pro and I lose 20% of the subs to drive error. At 2 minutes I'd probably lose 80% to drive error. With a scope half the focal length at say 440mm, which is where my F5.5 ED80 is, I get 2 minutes unguided and keep at least 80% of subs. The ED80 is shorter and lighter too which helps.
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