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Can't coment on the 15mm , but I have the GSOSV40mm with GSO2X barlow and have used it in my f6 with good results alone or with the barlow.
It's even better in my f7.5 refractor .
Used it in a Sc a few weeks back and was very impressed with edge performance considering the price.
Will be able to tell you more tomorrow , as to night Striker comes over for a night viewing. He has an f10 Sc and we will be doing a comparo between the GSO , Andrews 30mm and his new family of Nags , in his scope an f6 newt and my 80mm f7.5 refractor.
Basically using a cheaper 4 or 5 element EP with a good barlow is going to improve it's edge performance in fast scopes so an f10 is not a real problem.
What your doing is basicaly what a AL Nagler has done by combining an EP and barlow together to make a better corrected EP.
Last edited by mch62; 02-04-2005 at 12:51 PM.
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