I use a Kirk King Cobra head with my 600mm f4.
IMO a gimbal head is almost mandatory with a lense the size and weight of the 600. I've captured birds in flight with it but it almost needs a side mounted sight to give you an approximate area where it is pointed. Once captured in the viewfinder its easy to swing the lens/camera combo to follow the birds.

Using a ball head seems to be adding another level of complexity to the equation as the unclamped head will want to let the lens/camera combo flop over.

Kenneth Waller
http://www.pentaxphotogallery.com/kennethwaller

----- Original Message ----- From: "Paul Stenquist" <pnstenqu...@mac.com>
Subject: Re: Colusa Preserve Activity


Gimbal heads are great, but a decent one is in the $600 range. It's on my wish list.

Paul via phone

On Mar 10, 2017, at 4:18 PM, Stanley Halpin <s...@stans-photography.info> wrote:

Have you tried a gimbal mount?

e.g., https://www.bhphotovideo.com/c/product/404536-REG/Wimberley_WH_200_Gimbal_Type_Tripod_Head.html

stan

On Mar 10, 2017, at 3:40 PM, Jack Davis <jdavi...@comcast.net> wrote:

When the camera/lens weight
is as heavy as it is with the DFA,
a tripod is preferable. Hand
holding, however, allows a much freer sweeping motion to follow the target.
The longer reach does make it more
difficult to "find" the bird upon take
off or as it passes.

J

Sent from my iPhone

On Mar 10, 2017, at 9:13 AM, Paul Stenquist <pnstenqu...@mac.com> wrote:

Nice. The Grackle is very sharp and detailed. Good job on the duck as well. Shooting birds in flight off a tripod is difficult.

Paul
On Mar 10, 2017, at 11:30 AM, Jack Davis <jdavi...@comcast.net> wrote:


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