I'm not sure about the lens. Trouble is
- if you go with a tripod you need a fast short fl lens, otherwise stability and lack of tracking will be a problem. With this the lens becomes expensive. And dark skies!!
- A slower longer FL lens is cheaper but then you'll need some sort of tracking. Now the mount is more expensive.
So I don't know what to suggest. Depends on whether you want to go for DSOs or nightscapes. They are two very different things which require different equipment. Except they can both start with a basic DSLR
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