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GSO barlows...
I am hoping that some one might be able to help me out.
I was looking to get a 2" barlow for my telescope. On Andrews web site they have:
ED 2x magnification, 2" (with 1.25" adaptor), FMC, 2 element, achromatic and
2x magnification, 2" (with 1.25" adaptor), FMC, 2 element, achromatic.
Could some one tell me what the difference is (apart from the price)?
Cheers - Craig.
Last edited by Craig.a.c; 24-08-2008 at 10:22 PM.
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