I'm looking for a gimbal head to initially take a 100-400, but then to take a 300 or 400 f2.8 (when the bonus arrives
). The use is primarily wildlife in lowish light conditions. The only model I've been told about (by a wildlife pro) is the Wimberley. I now see that there is the Mk 1 and Mk11 versions, with the Mk1 significantly lower in price. Another brand that has now come tio my attention is the Kirk king Cobra. Any recommendations against the Mk1 (it's miore in my price range at the moment). Should I save for the MkII? Does the Kirk have any advantages or disadvantages over the Wimberley?
All help most gratefully received 

Fortunately no permanent damage was done, but it put the fear of sidemounts in me.
