Agreed, the cover is annoying. The same is used in the 200-400. Both lenses do not attract much dust probably due to the long lens hood. In my field I usually stay in one position for a while so packing and unpacking is no real bother but I imagine a birder would move around.
If you find a clip on lens cap please advise as I like to cap my lenses when not in use at airshows as some props and helicopters can throw up lots of rubbish in the air, red arrows and other smoke generating acts can throw lots of diesel oil into the air, you dont want that on your front element!
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