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Celestron Omni XLT 150 Manual

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Figure 3-3
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The Schmidt-Cassegrain optical system (Schmidt-Cass or SCT for short) uses a combination of mirrors and lenses
and s referred to as a compound or catadioptric telescope. This unique design offers large-diameter optics while
maintaining very short tube lengths, making them extremely portable. The Schmidt-Cassegrain system consists of a
zero power corrector plate, a spherical primary mirror, and a secondary mirror. Once light rays enter the optical
system, they travel the length of the optical tube three times.
Inside the optical tube, a black tube extends out from the center hole in the primary mirror. This is the primary
baffle tube and it prevents stray light from passing through to the eyepiece or camera.
Figure 3-2
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… 19 …


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