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I have never found it to be reliable Greg. It will get you close but the best way is to get an image of an out of focus star in the centre of the frame. Make an adjustment, return the star to centre and repeat as many times are necessary to get collimation nice. Al's collimation aid also helps too.
I use Maxim so I can have the cross hairs to centre the star. I set maxim to focus mode and then just repeat. It just chugs along and I make the adjustments I need to make.
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