Comments on: How do you determine the magnification of a telescope? http://www.telescopebuyingguide.com/blog/how-do-you-determine-the-magnification-of-a-telescope/ Thu, 17 May 2012 20:18:47 +0000 http://wordpress.org/?v=2.7 hourly 1 By: Geoff G http://www.telescopebuyingguide.com/blog/how-do-you-determine-the-magnification-of-a-telescope/comment-page-1/#comment-324 Geoff G Sat, 07 Feb 2009 17:04:15 +0000 http://www.telescopebuyingguide.com/blog/how-do-you-determine-the-magnification-of-a-telescope/#comment-324 First of all, I've never heard of anyone making a 10" f/6.13 Schmidt-Cassegrain. Probably you mean a 10" f/6.3, which Meade made for a while. To calculate the focal length of this telescope, multiply the aperture (in millimetres) by the focal ratio, i.e. 254 mm x 6.3 = 1600 mm. The magnification is the focal length of the telescope divided by the focal length of the eyepiece, i.e. 1600 mm / 30 mm = 53x. The only 16" Schmidt-Cassegrain on the market is an f/10 made by Meade. Its focal length is 406 mm x 10 = 4060 mm. The 30 mm eyepiece will yield 4060 mm / 30 mm = 135x. First of all, I’ve never heard of anyone making a 10″ f/6.13 Schmidt-Cassegrain. Probably you mean a 10″ f/6.3, which Meade made for a while. To calculate the focal length of this telescope, multiply the aperture (in millimetres) by the focal ratio, i.e. 254 mm x 6.3 = 1600 mm. The magnification is the focal length of the telescope divided by the focal length of the eyepiece, i.e. 1600 mm / 30 mm = 53x.

The only 16″ Schmidt-Cassegrain on the market is an f/10 made by Meade. Its focal length is 406 mm x 10 = 4060 mm. The 30 mm eyepiece will yield 4060 mm / 30 mm = 135x.

]]> By: Tina L http://www.telescopebuyingguide.com/blog/how-do-you-determine-the-magnification-of-a-telescope/comment-page-1/#comment-323 Tina L Thu, 05 Feb 2009 12:05:00 +0000 http://www.telescopebuyingguide.com/blog/how-do-you-determine-the-magnification-of-a-telescope/#comment-323 objective focal length / eyepiece focal length objective focal length / eyepiece focal length

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