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Questions About A Dobsonian Telescope

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Posted by John Manetas/">John Manetas on March 20, 1999 11:34:17 UTC

I'm studing the plan for a dobsonian scope. There is a point I don't understand. OK the primary mirror goes at the back end of the tube, where the tailgaite is. The spider with the secondary and the eyepiece go at the front end, at a distance wich comes, with this formula. Now my question is, the front end of the tube remains open? I mean, not any kind of mirror or filter to protect from dust coming into the scope? Thanks!

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