Re: (ATM) Coma and Telescope Design

[mbartels@efn.org (Mel Bartels)]

    Primary mirror diameter (inches) = [8      ]
    Primary mirror focal length (inches) = [52     ]
    Diagonal size - m.a. (inches) = [1.6    ]
    Diagonal to focal plane distance (inches) = [7.5    ]

Off-axis rad.   illum.   light loss          Off-axis rad.   illum.   light loss
===================================          ===================================
0.00 inches    100.0 %    0.00 mag.          0.70 inches     63.8 %    0.49 mag.
0.10 inches    100.0 %    0.00 mag.          0.80 inches     54.4 %    0.66 mag.
0.20 inches    100.0 %    0.00 mag.          0.90 inches     45.3 %    0.86 mag.
0.30 inches     98.5 %    0.02 mag.          1.00 inches     36.6 %    1.09 mag.
0.40 inches     91.3 %    0.10 mag.
0.50 inches     82.5 %    0.21 mag.                   +------------------------+
0.60 inches     73.2 %    0.34 mag.                   | Please select:         |
                                                      |------------------------|
Illumination may drop to 70 % for visual use.         | a. another analysis    |
Max field for visual use with 68 deg eyepiece         | b. change diag. size   |
  and 7mm exit pupil = 1.08 inch radius.              | c. change diag. to     |
                                                      |       focus distance   |
Diagonal offset = -0.056 inches parallel to focal     | d. quit                |
  plane, or -0.079 inches along diagonal surface.     +------------------------+
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Regards, Mel Bartels, Springfield, Oregon, USA
mailto:mbartels@efn.org
http://www.efn.org/~mbartels/