The Mark 7B Cam head ,designed to support the full facility Studio/OB Camerasand portable cameras with large lens,Viewfinders and Prompters
The Mk 7B is a modern Cam Head offering perfect balances and precise performance in both Studio and OB locations
The LF system provides continuously adjustable fluid drag control with rotary knob control for tilt and Pan Axis.
The Vinten Mk-7B LF Cam Head is a pan and tilt camera head, designed to support a variety of cameras, lenses and prompters in perfect balance over a tilt range of ±44.5° to ±60°, dependent on the cams fitted.
The Mk-7B head uses lubricated friction (LF) mechanisms in the pan and tilt axes giving adjustable drag to achieve smooth operation. Whip movements may be executed through both axes regardless of drag setting. Both pan and tilt mechanisms are fitted with a brake.
The Mk-7B head is fitted with a sliding plate giving a large range of fore and aft adjustment. This adjustment can be extended by moving a wedge adaptor to either of two positions on the sliding plate.
The Mk-7B construction is largely of aluminium alloy providing a lightweight but robust assembly able to accommodate loads of up to 250 lbs(114 kg). The head has a standard flat base and can be mounted on tripods, pedestals or any suitable firm surface.
The Mk-7B head consists of two main assemblies:
*The camera platform assembly
* The body assembly
Camera platform assembly
The camera platform assembly comprises a casting in which a sliding plate can be adjusted fore and aft by means of a lead screw. A wedge adaptor is mounted on the sliding plate and accepts a standard camera mounting wedge. Two cam profile plates are fitted, one on each side of the platform casting. These are a matched pair, selected from the range available, to enable the load placed on the head to be held in balance. The cam plates operate over two rollers fixed to the body. The rollers support the total weight of the payload. A tilt brake cam plate is attached to the underside of the platform and slides between the brake shoes of the tilt brake assembly. When the tilt brake is applied, the brake shoes clamp the plate and
prevent movement in the tilt axis.
The sliding plate is adjustable 76 mm (3 in.) forward and 203 mm (8 in.) back providing a total range of 279 mm (11 in.). A further adjustment of 95 mm (3.75 in.) can be obtained by moving the wedge adaptor to the alternative position to give adjustment of 171 mm (6.75 in.) forward and 108 mm (4.25 in.) back.A clamp is provided to lock the sliding plate in position.
A locking device on the operating lever of the wedge adaptor prevents accidental release of the camera.
A tilt drag unit is mounted under the platform and provides drag in the tilt axis. The degree of drag is varied by means of an adjuster knob. The platform may be locked in any position by the tilt brake , or in the horizontal position by two cam bolts which engage with the cam plates.
A telescopic pan bar is provided with the head as standard. A second telescopic pan bar or nontelescopic
pan bars suitable for mounting lens controls are available as an optional extra. Pan bar mounts are
provided on each side of the platform, enabling the pan bars to be positioned radially through 360° in 6°
The Mk-7B body assembly comprises a casting which houses the pan drag mechanism and pan brake in its base. Each of the two body casting sidewalls houses two pairs of guide rollers, between which a platform guide bar is supported. A brake guard gate is mounted on the aft end of the pan housing and indicates the position of the pan and tilt brake levers. Tilt brake shoes are attached to one of the sidewalls and grip the tilt brake cam plate when applied. Two cam bolts are mounted on the sidewalls and can be engaged with holes in each cam plate to secure the platform in the horizontal position. Two guide bar pins in the sides of the body casting engage in holes in each guide bar and are used in conjunction with the cam bolts to
support the platform for transport of the head or when changing the cams.
The guide rollers are mounted on pivots: four fixed, in the aft end of the sidewalls; and four eccentric, which can be adjusted, in the fore end of each sidewall. The fixed rollers run in grooves in the guide bars to prevent lateral movement.
Cam rollers are attached to both sidewalls and support the weight of platform and camera.
The degree of pan drag is varied by an adjusting knob located adjacent to the brake guard gate. Movement in the pan axis is braked by a clamp acting on a disc in the pan housing.
A circular spirit level, mounted in a lug on the rear face of the body, is used to level the head before use.
The bottom of the body forms a standard flat base with four 3/8 in. BSW mounting bolt holes equally spaced
on a 4 3/8in. diameter
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