I have G3 and 45-200 lens I want to start using for bird shots and taking pics from a distance of our non-stop 2 year old. A tripod is too unwieldy for either task so I was contemplating a monopod. I've never used a monopod and don't know anyone who has. Any thoughts on how useful one might be? I was contemplating one of the Manfrotto 'automatic' models: either the sturdy 685B or the lighter 334B.