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| Secondary Size Might Be Wrong - Need Help Urgently
Forum List | Follow Ups | Post Message | Back to Thread Topics Posted by Dave Sellors on May 26, 2003 16:43:09 UTC |
I've almost finished building a 10" dob (Richard Berry book), my first time doing this stuff. Mirror is 10" F/5, secondary size is 1.83" I laid out optics using Newt 2.5 and did ray trace using Visio. Newt reported everything to be fine (no YES's). The focuser hole location was based on achieving a very thin, almost imperceptible, black ring around the primary when looking at the secondary mirror through the focuser.
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