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| Refractor Help
Forum List | Follow Ups | Post Message | Back to Thread Topics Posted by Sonya Ward on November 17, 2001 00:59:17 UTC |
I am building a refractor. I have a 4.6" acromatic lens. Haveing trouble with focal lenght. The guy I purchased the lens from said it was f8. So how long should the tube be? And how close does it have to be ?
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