Depends on the lens in use. I use a 70-300 DO a lot and this lens is apparantly prone to flare/loss of contrast so always have the hood in place. It stores reversed on the lens so is no problem to carry around. I do not bother with my other lenses, shielding the lens if necessary with my hand.The one other exception is my new 'toy,' the 400 DO which has not got a thread to take a filter to protect the front element so I always put the hood on to protect that large hunk of very expensive glass.
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