and, wide open through the zoom range - you run the risk of not getting the wide depth of field needed to get wing-tips on both side in focusblur-free. You can have a shutter of 2500 but if your DOF is not wide enough for various birds - it means out of focus wing times often.
the 70-300 IS non-L (before my L) was sharpest at f/9 and accounts for me getting great blur-free focussed shots because of the wide f/9 DOF. I'd still get bokeh if the subject was close enough and the background was far enough.
as far as weigh goes, get rid of the Canon strap on your body and get a real strap, no matter what lens you use. Real straps can seemingly lesson the weight on your neck substantially. That means longer shooting.
I concur and use this one. Can carry the load all day.
http://www.procameragear.com …cPath/1_21/sort/2a/page/3![]()







