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Old 28-04-2010, 09:31 PM
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strongmanmike (Michael)
Highest Observatory in Oz

strongmanmike is offline
 
Join Date: May 2006
Location: Canberra
Posts: 17,152
LOoks neeeearly as good as Guys

Just a suggestion, rather than using the lens diapgram to change the F ratio, instead use an aperture stop (home made) in fornt of the lens ala Bert. This way you will get nice round APO like stars without the multi pronged diffraction spikes while still reducing the edge of field abberations

Mike
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