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Old 14-02-2014, 11:24 PM
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strongmanmike (Michael)
Highest Observatory in Oz

strongmanmike is offline
 
Join Date: May 2006
Location: Canberra
Posts: 17,692
Quote:
Originally Posted by alpal View Post
Thanks Mike,
Do you have any shots of a bright star such as Alnitak that you could post - just for comparison?

I have re-collimated the telescope since those Alnitak images.
I have had a look at many other images before & since the Alnitak
image & I can't find any evidence of a twisted rope like
formation - rainbow colours - from any star's diffraction spikes.
Then again - none were so bright as Alnitak.
I will revisit this during my next imaging session.
It could be normal - but it could also be that it was slightly out of focus.

cheers
Allan
Not as bright as Alnitak but the rainbow effect is pretty obvious, how are the bright stars in this? Looking again at your Alnitak I think it is very slightly out of focus.
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