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Up to 60 sec shots with short FL lenses perhaps not. But, like Gary said "Why Not?"
Your 40D will be most likely connected to a Laptop running the EOS Utility which controls camera and exposure setup anyway - so utilize PHD or whatever your choice of guiding software is too.
Belt and braces!!!!
I'm trying to push way past the safe guiding area of my mount on every exposure, so for me, autoguiding is permanently on.
Couldn't imagine life without it - perhaps a bad thing...one more thing to go wrong!
Cheers
Doug
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