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iOptron EC
There is a lot of misinformation/commentary or at least out of date information out there. My mount is an EC model, it works very well. I can guide it when at home and use it unguided when mobile.
The encoders being relative is not an issue unless you intend to put the mount in a remote/automated setup.
As for how long you can run unguided - well it depends of course to give the consultants answer. If your PA is good and the imaging scale not to fine then 3-5 mins should be achievable.
You can see some traces from my mount both guided and unguided plus and image of Eta C taken unguided from my home site (Bortle 8 inner west Sydney).
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