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93643 Celestron Telescope Tele-Extender-Deluxe 93643 Celestron Telescopes Deluxe Tele-Extender #93643 for Schmidt-Cassegrain telescopes is a hollow tube that allows you to attach a camera to your telescope, with an eyepiece installed. By using Celestron Tele-Extender-Deluxe 93643 in combination with an eyepiece, you can increase your instrument's effective focal length to well over 10,000mm! And this corresponds with a matching increase in image size. This technique is known as eyepiece projection photography. The following formula can be used to determine approximate effective focal length :EFL = Telescope focal length/Eyepiece focal length x DF...  

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Overall rating: 12345
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