| Photo kit tips please
Some years ago I got into photography but what with bikes, marriage, kids, cricket etc etc, it fell of the end of my hobby list. A few weeks ago we bought a Canon EOS 400 mainly because I had a stack of kit from my 35mm EOS.
I would like to get back into it, just as a hobby photographing bikes, parked and racing, particuarly IOM TT.
I have a zoom lense with the following:
Ø 55 Sigma Zoom AF-λ
1:4.5 ~5.6
F = 75 - 300
My thinking was to get something longer and have looked on line at a SIGMA 170-500mm f/5-6.3 APO (CANON AF) but as its over £500, I need to be sure its going to be what I want and its going to be much better than the old one.
Any assistance or guidance would be appreciated. | 
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