Sorry to HiJack the thread jaybeepee.
Guys I have a 500D and also looking for a second lens, but just have some question....
1 - what is USM & HSM, I know it stands for ultrasonic / hypersonic motor,but what is it? the speed at which it can focus?
2 - IS, do I need it? does the camera body not do this, or only the lenses with Canon?
3 - Should I concider Sigma?
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