My Telescopes
12.5inch Dobsonian, CAD 12.5
(CAD stands for Computer Aided Dobsonian)
to Japanese/“ú–{Œê‚Ö
Specification of CAD 12.5
Primary Mirror: Diameter=12.5inch, Focal Length=76.3inch, f/6.0
Manufactured by Coulter Optical Co.
Surface Error: 0.090 wave (measured by T. Taki on January 1, 1994)
Diagonal Mirror: Minor Axis=2.14inch
Manufactured by LUMICON
Tube Assembly: Serrurier Truss Type
Mount: Dobsonian Mount with Azimuth and Altitude Setting Circles
Aiming accuracy by pointing program "TAKI.BAS" is 0.1 degree.
Date of First Light: February 5, 1990. The mount was modified in July, 1993.
Eyepieces:
Eyepiece Apparent Field Magnification Actual Field
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LV 5mm 45deg 388x 7.0'
Or 7mm 45deg 277x 9.7'
K 12mm 42deg 162x 16'
WF 15mm 65deg 129x 30'
K 25mm 42deg 78x 32'
K 27mm 50deg 72x 42'
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Detail of Setting Circles
Horizontal setting circle is made of a tape measure wrapped around a circular base.
Altitude setting circle is attached to the altitude bearing disk and has a vernier to read 0.1 degree.
