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Frank,
Chris (Omaroo) takes exposures for several seconds to show up the spikes. When I used the 40D, I would bring the LiveView on the eeePC screen and use the Bahtinov Grabber software over the LiveView image. It was very fast and I could make adjustments in real time, zoomed in at either 100% or 200%.
I have since found that using the Bahtinov Mask and Bahtinov Grabber gives me out of focus stars. I think this is due to some slight chromatic aberration in the ED127. When the Bahtinov Grabber software indicates "perfect" focus, my stars are void of colour and I see a bit of a chromatic halo around the stars. I then adjust the 10:1 focuser out by a smidgeon and I see colour return to the stars and I know I'm in focus. This is most evident on red stars. So, the software gets me to within a hair's width of focus. Still, that's pretty good I reckon.
H
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