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When you say the images blur after 90 seconds are you using autoguiding or is this with no autoguiding?
I take it you mean without autoguiding. Getting 90 seconds with star elongation and no autoguiding is a mark of a nicely setup mount. I am sure other super mounts could top that but that is a good standard.
Autoguiding should take it from there. PEC is something used with autoguiding not without (at least I have never heard of PEC without an autoguider).
Can't say for EQ5 but generally PEC reduces PE quite a bit.
Greg.
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