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If the model has SLT, it is a GOTO computerized scope. SLT means star locating telescope in Celestron lingo. Any GOTO scope is also, by default, a motorized telescope, too. The 90SLT is a GOTO (see the Celestron website), so your choice is really a difference in the optical systems - a 90 Mak vs a 102 mm short refractor. In general, more aperture means more objects seen, but a difference of 12mm between these two is not really significant. The Mak will be better corrected for color and will be definitely sharper at the edge of the field. Short focal length refractors at this price are especially weak in these two areas. On the other hand, shorter focal length means you can get lower magnifications with any given eyepiece and that can translate into wider fields of view. That's a plus for photography and large star clusters and nebulae. A Mak gives you higher magnification with any given eyepiece by virtue of its folded optics. That can be a plus for high magnification work like planets and double stars. If this is your first scope, you are likely to want to start on planets and that, then, would favor the 90.
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