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Hi Sam.
If you are worried about colour correction, (chromatic aberration, i.e., seeing a blue-yellow halo around a bright object), when using a achromatic, (doublet lens), refractor. You can purchase a "minus violet eyepiece filter" which will help correct this to some degree.
Cheers!
Last edited by astro_nutt; 18-09-2010 at 08:31 AM.
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