155 EDFS green around limb of moon


Dec 21, 2013

 


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#42661 Dec 21, 2013

I just got a used 1997 AP 155 EDFS and was looking at the full Moon and saw a thin green tinge around the limb of the full Moon. The detail was fantastic but I am just wondering if that is ok or if the green shows that the objective is out of collimation. I know the full Moon is something brighter than I will ever image but just wanted to make sure. I was using a 20mm Nagler Type 5 and 13mm Type 6. What is interesting is I have a Kokusai Kohki 30mm Widescan and it showed a slight purple color around the limb. I don't have a simple orthoscopic or plossl eyepiece to test it with more simple optics. Is this normal? I though high end APOs never showed color.



Robert Chozick

rchozick@...



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