david_calane

<p>Thanks for pointing out that IS is not needed in this situation. So for the high speed shots I'll probably stick with the 28-135 with IS. <br> Should I turn IS back on for the 1/30 shutter speed "pan with subject to blur the background" motion shots?</p>

<p>I need to shoot a couple of bike races where the subjects will be moving 30MPH. I have two lens choices. The Canon EF 28-135mm f/3.5-5.6 IS USM or the Canon EF 70-200mm f/2.8L USM <em><strong>WITHOUT</strong></em> IS. <br> For previous events I've used the 70-200 and shooting at a shutter speed of 1000 will hit about 80% very sharp images. The problem is that 70mm on a crop sensor isn't as wide as I'd like for many locations on the course. I'm shooting during the day so the 2.8 isn't a big advantage. BUT, I'm guessing that an L series lens can autofocus faster and with better accuracy than the standard EF 28-135mm. OTOH the IS in the 28-135mm should allow me to hit more sharp images.<br> Thoughts?</p>