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It depends how into the hobby you are going to go. A 4" telescope is pretty good for looking at the brighter Deep Sky objects - like those listed in Bright Star Atlas.
So while the telescope may have a data base of 40,000 objects, it's only really good for viewing the many hundreds in that atlas. Which isn't a bad thing - I still own and use several 4" telescopes. Though I use larger aperture a lot of the time.
Regards,
Renato
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