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Scale Drawings

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Posted by Jon Caldwell on July 16, 2002 18:27:18 UTC

To finalize your layout, you'll need to decide on a tube diameter and a focuser, so you know where the image plane will end up. I made a quick drawing in autocad, assuming a 20" tube and a focal plane 2" outside the tube. The drawing shows the diagonal will be 12" inside the focus and the minor diameter of the diagonal will be 4". This assumes a fully illuminated image 1.5" across. Your field of view will be just over 1 degree. I can send this drawing in .wmf format for viewing in Microsoft word, if you want. E-mail me at with your e-mail address.

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