> Still, given that it's a high-powered zoom lense, you need to hold it very 
> still anyway...

A rough rule of thumb is that you need a shutter speed of 1/focal length or 
faster to get a blur-free hand-held shot.  With the Canon 600m F4 (costing 
just over 7K) you would be limited to using it in daylight handheld, or 
maybe just about under floodlights if you crank up the ISO setting and can 
tolerate a bit of image noise in the darker areas.

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