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Well_is_it
what do Canon EF 'ultrasonic' lenses do thats special?
like this one
http://www.ebay.co.uk/itm/canon-zoom-lens-EF-28-80mm-ultra-sonic-/331786392625?hash=item4d40029431:g:gQUAAOSwPc9WwLT9
description says ideal for dental photography!?