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When I use film, my 'best' lens used to be a Sigma 75-300mm APO f4.5-5.6
I have a Sigma 400mm f5.6 but it was too long (and fixed focal length) for most of the airshow shots, but, as time has gone by they are moving the aircraft further and further away from the spectators (and flying higher).
I'm considering a Sigma 28-300mm f3.5-6.3 (autofocus) for my digital Pentax K200D Super as the above are manual focus only.
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