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Satellite spotting can be a completely free hobby. However if you want to spend here are some tips on equipment complimenting the information in the books... 

Binoculars are perfect for satellite spotting. The Sony a7S and now the a9S  is the ultimate Digital SLR camera for recording the night sky. This one is expensive but the quality is so high that it has been used on the International Space Station. This is the camera I dream about at night...

To calculate how effective binoculars are to each other, calculate objective lens diameter squared, divided by magnification squared.

Example 7x50 binoculars... 50x50=2500   7x7=49    2500 divided 49 = 51

if you wish to spend