Question about C-Star Optics TT-150 Telescope
The numbers on the eyepieces are the focal length in millimetres. You can calculate the magnification of the telescope by dividing the focal length of the main objective by the focal length of the eyepiece in use, so if the main focal length is 700mmm and you use the H20 (Huygens 20mm) eyepiece, you will get a magnification of 35. The SR6 ( Symmetric Ramsden 6mm) would give about 117 magnification. You will find that the LOWEST magnification is about the only one that is usable. I wouldn't use the Barlow at all.
There is a good website full of info about this HERE
Posted on Dec 31, 2010
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Posted on Jan 02, 2017
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