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Thanx Marc,
Your reply makes sense!
I used the wrong terminology. I used focusing down instead of up cause I see the focuser going "down" into the tube (newt) but your right that it is going up now that I look at it.
I couldn't get the focuser to go any further "up" the tube. So by reading your reply a barlow would give me the extra travel up the scope...I'm guessing.
However I'm just a little confussed with "No. If the light is close to a point source you'll still see those diffraction spikes with long exposures.".
What do you mean by 'point source'?
thanx Bartman
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