Also, you won't see anything even close to what gets posted on /r/astrophotography - those images take hours of pointing your telescope steadily at the same object and collecting all the precious photons with a camera. And 4" is not that much, considering we typically recommend at least 8" for a starter DSO observer (that's 4 times the light gathering capacity of a 4" instrument - it goes by the square of aperture). As for why this is, well, telescope's main characteristic that allows to see faint objects is the aperture. Out of those, star clusters, planets, and the Moon would be the best objects to observe. You'd be lucky if it showed you 10% of that! Depending on your location (how dark the sky is), you'll be able to see most of the Messier catalog items, Some of the brighter NGC objects, double stars, planets, and the Moon. Scope this large (4") will not show you all of the advertised 40,000 objects in the computer's database. You will need this to get yourself acquainted with the sky at least to a degree so you know where to point the scope for alignment procedure (yes, having computerized telescope will not save you from navigating the sky manually). I would recommend at least Plus version of the latter, because the basic one is, well, basic. I'm not familiar with any of the free offerings for the iOS platforms, but I can highly recommend the SkySafari app, which is paid, and is available for both iOS and Android platforms. Stellarium is a great choice for a PC, SkEye is a great little (free) app for Android devices. Secondly, get a program for a computer or a mobile device that will allow you to interactively view and navigate the sky. Pay attention to alignment instructions, as it is a crucial step for computerized Alt-Az mount like the NexStar. First of all, I would highly recommend reading the supplied manual for how to assemble and operate the telescope.
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