Harry, my husband bought one of these a few months ago. the pictures are so sharp they jump out at you, he handheld the lens not the camera for doing any flight shots, birds in flight and jet aircrafts.
His doctor can't understand why he has such a hernia and a twisted spine from just taking photos with a camera
. So he now has me holding the lens and he just shouts left! left! left! right a bit! up a tad and move faster. His back is fine now but my arm aches and I have gone deaf from all the shouting.
Easy to use but needs IS.