Because of their size and the heavy glass components inside, large lenses are subject to something known as 'zoom creep' where they have the tendency to extend or collapse under their own weight when pointed upwards or downwards. In some situations the problem can be easily solved by just holding the zoom ring, but other times you might need a
specialized tool.
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Source: http://feeds.gawker.com/~r/gizmodo/full/~3/6XKfsljhw3g/lens-band-a-livestrong-bracelet-to-eliminate-zoom-creep
Avnet Bharti Airtel Bt Group Canon
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