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Paul it should become clear if you understand the following:
1: Your mirror or objective lens, regardless of aperture, focuses all collected light of any single distant point to a single point at the focal plane.
2: The width of the focal plane that you get to see is determined by the field stop of the eyepiece.
3: The true field of view is the effective fov of the eyepiece divided by the ratio of primary FL to eyepiece FL.
Hope this helps
Last edited by Starkler; 08-06-2005 at 10:50 AM.
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