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Celestron Omni XLT 150 Review

4 Mar 2019, 08:14 UTC
Celestron Omni XLT 150 Review
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Celestron’s Omni XLT 150 is a modern take on the classic equatorially-mounted 6” Newtonian which was a staple of amateur astronomy from the 1920s through the 1980s. However, it makes a number of changes and improvements on that classic design, which I will discuss in this review.The Optical TubeUnlike older equatorially-mounted 6” Newtonians which were typically f/8 to f/10, the Omni XLT 150 is a fast, short f/5. This focal ratio produces a wider field and lower power with a given eyepiece but does require significantly more precise collimation. Also, it will have coma with a 2” wide-field eyepiece, though at f/5 you don’t strictly need a coma corrector to use the scope.The optics in the Omni XLT 150 are of decent quality, though you won’t get the same kind of planetary performance a longer Newtonian provides as the secondary mirror is larger in size relative to the primary mirror, decreasing contrast.

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