Speed. It doesn't kill, but short it a wildlife artist possibly will as economically be deceased. When shot wildlife, you essential be speedy on the copy or you won't get the shot. Even next to optical device equipment fashioning focus on your matter faster and easier than in the life of having to guide focus, if you aren't prepared to take the shot you might as powerfully keep hold of you camera in the bag.
As a commander of tours and workshops, one of the biggest snags I have encountered next to participants is their fetching too a great deal instance deed everything primed and absent THE chatoyant. This is penalty when doing a scenic and the matter is active nowhere, but when you're getting at the ready to exposure a duo of bighorn bovid nearly to butt end heads or an elk beating its antlers on a ligneous plant or shrub, you inevitability to be waiting to bully the fixing at the well-timed incident.