ralph

首先是Arca Swiss B-1
1.70 lb的东西能承重90lb,厉害！

b&h上的介绍

A B1 standard single axis ballhead, with panning capabilities. With quick release feature for quick mounting and dismounting of cameras. (Requires camera mounting plate.)

Ever since their introduction over thirty years ago, the Arca Swiss Monoballs have been at the forefront of quality and performance. Today, their unique shape(an ellipse rather than a sphere) is still what separates them from all others. With other ballheads, no matter how good the tension modulation, you invariably will need to increase the tension control as you move the load away from the center. This is because gravity has a greater effect on gear when not perfectly level. You are left with three undesireable options:
1) having tension too tight when the load is level
2) having tension too loose when the load is off-center
3) adjusting the tension every time you move between level and off-center.

The Arca Swiss eliminates the need to constantly modulate the tension, because its elliptical nature corrects it by virtue of its own design. The load stays exactly where you tell it to once locked into position. A separate control is set to apply a constant minimum friction, which allows the photographer the peace of mind that comes with knowing your gear will never move of its own volition. The heavier your gear, the more the advantages of the Arca Swiss become evident. The exquisite finish adds to the exact positioning capacity.

In actuality, there are two types of ballheads available. a) The B1 Series design, which is a single axis rotation with one locking knob; b) the B2 design, which is built on the double axis rotation, allowing movement around two distinct axes due to two separate balls encapsulated into one another and two individual locking knobs. The B1 Series single action ballhead is sold various ways. The "b" economic model, without panning capabilities, the B1 Standard with panning capabilities and the "G" large model, all sold with different camera mounting devices. All Arca ballheads mount onto 3/8"-16 tripod screws.


参考网站
Arca Swiss 介绍网站(可以在bh上订购）
http://www.thefstop.com/equipment/new/arca/arca.html
Kirk 网站
http://www.kirkphoto.com
Wimberley 网站
http://www.tripodhead.com/

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