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I know some could collimate a reflector but a 90mm f11 or 100mm refractor on altaz mount can serve use as a daytime scope also (avoid the cheap EQ mounts) & need next to no maintainance
A good pair of binoculars can also be a good choice for kids.
My 12 yr old has a bit of trouble moving around a 8", less so a 6" dob-it's a tad liter
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