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Hi,

I have an elongated star effect with my ASA 12N and the Wynne 0.95  I have made some test, by moving focus inside-outside good focus, and start to suspect there could be astigmatism in the system (out of focus elongated stars with 90 degree difference). Have anyone else notices this behavior?

 

I will switch to the 0.73 reducer, when weather allows, and see how it behaves.

 

All images 2 sec exposure Atik 490EX good collimation according to Glatter laser and tublug

 

 

Regards,

 

 
astigmatism.jpg

 

 

 

 

 

 

 

 

 

 

astigmatism.jpg

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  • 3 years later...

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