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You will have to shroud the upper half of tube or use at a very dark site.
If you are on a budget may I suggest you save a bit longer for a 6" f8 Dobsonian or better still an 8" f6 Dob. It will last you a lifetime.
My first telescope was a 6" f5.5 EQ which I still have and use as a wide rich field Dob. An 8" has nearly twice the light gathering capability as a 6". I wouldn't go less than 6" in a Newtonian reflector. A good quality 4" refractor would be an alternative but the low cost short versions do exhibit significant chromatic aberration which bother some people and not others.
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