What is the magnification of a telescope with a focal length of 200 cm,with an eyepiece of focal length 35?
Tuesday, June 8th, 2010 at
5:29 am
What is the magnification of a telescope with a focal length of 200 cm,with an eyepiece of focal length 35mm?
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200 cm or mm? 200 cm = 2000 mm – thats fairly long. Divide 2000 by 35mm – about 60 power? work it out with a calculator
Divide the focal length (in millimeters) by the focal length of the eyepiece (which is always stated in millimeters). So 2000/35 = 57x.
Your computer should have a calculator utility. Feel free to use it.
If you are looking to purchase an eyepiece to maximize your field of view, I recommend that for any eyepiece longer than about 32mm the barrel should be 2″ rather than 1.25″ (yeah, barrel sizes are still stated in inches), otherwise you’d be better off with a 30-32mm eyepiece because a longer focal length in a 1.25″ barrel will have the field of view cut-off and narrowed in spite of the lower magnification.
In other words, without going to a larger barrel eyepiece there will be no gain in field of view going longer than 32mm. Eyepiece design has some bearing as well, but for our purposes we’ll assume Plossl eyepieces.
Your answer is here…
http://www.skyandtelescope.com/equipment/basics/3303926.html?page=2&c=y
Wally