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Mathew
Haven't tried it but it seems to be a great idea although
it relies on a reasonable cross shape for the guide star
and I rarely get even close to this mythical shape they
keep showing. Usually I get some kind of "t" shape. The
biggest pain in the neck with ONAGs is the manual guide
focuser which you have to crudely push/pull until you get
some kind of focus. The focuser is so crude you can tip/tilt
it and get better or worse star shapes. I tried gluing a
3.3mm oval shaped piece of glass in the end of the focuser
tube and although there were indications of better (normal)
star shapes I couldn't get the thickness right so gave up
for the time being. There are rumors that they are making
an optional mini crayford focuser to ease focusing problems
but I suspect that is an optimist daydream as is a correcting
glass insert to give normal star shapes!
Cheers
Stephen
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