Hi Jim,
From my experience (I have both HEQ5 and AZ-EQ6) you won't be able to reliably take 90-120s unguided exposures with AZ-EQ6. But you would be able to reliably take longer guided exposures with ED80 on both mounts. AZ-EQ6 is substantially heavier than HEQ5 and feels tougher, however, as Lewis has already mentioned, tracking with AZEQ6 is not overwhelmingly better than that with HEQ5.
Lewis- thank you for sharing your experience with Vixen mounts.
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