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Originally Posted by Darkel
BTW I've heard many people talking about those magic (and a bit less expensive than the equivalent IS models) 200/300mm f2.8 without IS, it's IMO not that great considering some usual situations when the car is far away and the light is crap, "whoaa f2.8 power" and they end up with 2mm of the front bumper sharp and the rest nicely blurred o_O
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For info, (Applies to 300D, 350D, 10D, 20D, 30D)
Focal length of 200mm
Aperture : F2.8
Subject distance : 30 meters
Gives a total depth of field of : 2.4 meters (in total sharpness)
This is enough for cars - the out of focus falls off gradually.