Jobu has just released a new swing-arm upgrade for the Jr.3 gimbal head. This new design integrates the quick-release clamp into swing-arm. This lowers the weight 1/8 th of a pound to 1.5 pounds (680g) total and lowers the mounting point. The new integrated QR swing-arm also uses a new larger fluted knob.
See the Jobu site for more info: http://www.jobu-design.com/catalog/item/2588354/9467589.htm
The Jobu Jr.3 has been my gimbal head of choice for a few years now, no other head that I have used has the Jr.3's combination of lightweight, compact size and performance. This head is a pleasure to use in the field and will easily support most if not all super telephoto lenses without a lot of extra weight.
On my recent trip to Alaska I was able to try a participant's new Canon EF 600mm f/4L IS II USM super telephoto lens on my Jr.3 in side mount configuration and it balanced beautifully with out any stress or flex. The Jr.3 design allows you to mount lens in bottom mount or side mount depending on how you have the head set up. By the way the new 600 is a seriously nice lens, in fact I think that this is the most interesting addition Canon has made in their lens line up in a long time.
More about the Jobu Jr.3 gimbal head:
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