Lenses, well, for astro work, you wont NEED any, but they can be useful for really wide fields... For astro work, the lens quality is important... For terrestrial shots, 90% of the time, you get what you pay for... A $1000 70-200 F/4L will take better photos than a $300 Sigma 70-300... That said, unless you take to photography as a semi-full time hobby, this kind of spending really isnt needed..
I have lenses that cover every focal length from 10mm right the way through to 600mm. But as I said, unless its a serious serious hobby, this simply isnt needed.
A widefield and a telephoto/telephoto zoom is really all you need.
18-55mm or equivilant, and a 70-200/70-300 should suffice.
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