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Use EOS Utility on the computer.
Connect camera via USB.
Load up Live View Remote Shooting.
Place star in centre of frame.
Tick 200% box.
Better, yet: create a Bahtinov Mask.
Download Bat Grabber.
Load Bat Grabber and draw a box around a star in EOS Utility's Live View display.
Turn focus knob and watch your star come in to focus in real time.
EOS Utility will be on the disc which came with the camera. If not, I believe Canon has relaxed their rules and it is now a free download (not just free update for download).
H
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