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Message: <blockquote data-quote="westmill" data-source="post: 60569" data-attributes="member: 9330">If you are covering a race etc, its not likely you will have time for lens changing during the event. I use Three bodies with a different lens on each.One of the Three is set up as a remote. The 70-300... you have to remember 70mm on apsc or DX cameras acts as a 105mm. The 50 is more usable as it acts as a more useful 75mm. The 200mm end also eaquals 300mm on DX. You need to watch and think of shutter speeds when using such lenses. An old rule of thumb is to use a shutter speed at least as long as the focal lengh of the lens in use. A lot forget to remember to compensate for DX use. That takes care of magnified shake. Then you need to add on top of that for subject movement of the horse etc. You will need to be shooting at least 1000sec and preferably a little higher to obtain pin sharpfreeze of a horse at 200 mm.</blockquote>