Originally Posted by
Christian and Beccy
OK, thats fine, but I'm not going to stop droning on about IS until someone says it's not worth having......
It's worth having on an overcast motorsports or stadium day, and indoors. On a sunny summer's day, you probably won't really have a need for it
By that I mean that the amount of light on a sunny day will be sufficient for you to select a speed which will prevent shake making IS pointless.
TBH, 250 or 300 won't make that much of a difference trackside, your MP count is high enough that you can crop without loosing much image quality.
Out of the two, I'd choose the better lens in terms of quality, etc... than either based on IS or 300mm
HTH