Oh, yeah? If you're zoomed into something with your 300mm lens, your slightest movement will appear to make your target jump around. Have you ever done any hunting? If you've ever looked through a rifle scope, "off hand" [hand held] then you know how hard it is to hit something, which is why a good hunter ALWAYS rests his rifle on something for shooting. At 100 yards, you'll be glad you had it when you see something, say like a California Condor, eating, or a bear, or mountain lion, something you REALLY DON'T WANT TO GET ANYWHERE NEAR!
Jaybird