I have a cheaper $70 tripod "inca" brand that works ok for me. It is a ball head with a 4kg rating. It will hold my 4" 700mm f7 telescope (which is probably right on its limit). If you want to try wide field astrophotography you definately need a ball head (and a camera with a swivel screen). The only bad point with my tripod is the quick realease attachment, I would prefer a direct screw into camera mount. I guess it depends on how often you are going to use the tripod, if you can justify the expense.
Cheers Rick
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