Telescope: Newtonian 10 inch F4.5
Produced by NEWT version 3.0
Filename: C:\NEWTWIN\10_REX.NWT
Specifications/Dimensions:
Unit of Measure -------------- inch
Primary Mirror Diameter ------ 10.0
Focal Length ----------------- 45.0
Focal Ratio ------------------ 4.5
Tube Inside Diameter --------- 11.875
Tube Thickness --------------- 0.2500
Focuser Height --------------- 1.8
Focuser Inside Diameter ------ 2.0
Focuser Extra Travel --------- 0.5
Focuser Camera Travel -------- 0.0
Diagonal Minor Axis ---------- 2.6
Diagonal Offset -------------- 0.1444
100% Illumination Diameter --- 0.8798
75% Illumination Diameter ---- 1.8099
Front Aperture Diameter ------ 11.768
Mirror Face to Focuser Hole -- 36.512
Focuser to Front End of Tube - 8.1
Mirror Face to Back of Tube -- 2.9
Tube Length ------------------ 47.512
Eyepieces:
Focal Length Power Exit Apparent True
(mm) Pupil Field Field
------------ ------ ------ -------- -----
40.0 28.58x 8.889 44.0 1.5
25.0 45.72x 5.556 50.0 1.0
16.0 71.44x 3.556 50.0 0.6
12.0 95.25x 2.667 50.0 0.5
9.5 120.3x 2.111 50.0 0.4
6.7 170.6x 1.489 50.0 0.2
5.0 228.6x 1.111 50.0 0.2
Performance:
The theoretical limiting magnitude for a 10 INCH
objective is 13.8.
The obstruction of the primary surface area by the
diagonal is 7% which results in a reduction in
light gathering ability.
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The theoretical resolution (Dawes limit) for a 10 INCH
objective is 0.46 arc seconds.
The obstruction of the diameter of the primary by
the diagonal is 26%, which affects image quality by
increasing diffraction and lowering contrast.
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Maximum useful power is about 500x
(for 50x per inch of aperture).
Minimum useful power is about 36.3x
(for a 7mm exit pupil).
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Angular field of view for the 100% illuminated
area is 1.126 degrees. The diameter of the field
is 0.8798 inch.
Angular field of view for the 75% illuminated
area is 2.317 degrees. The diameter of the field
is 1.81 inch.
NEWT v3.0 for Windows 3.1 copyright Dale A. Keller, 1997