BOLEX H16 SBM Instruction Manual page 48

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Bolex matte box. Acts as a highly efficient lens hood
and can also be used as a portable accessory for titling
and trick effects, such as entering a room through the
keyhole, making the same character appear several
times on the same picture, framing a landscape in
binoculars, etc.
Hand grip. Gives a good firm grip on the camera,
thereby increasing camera stability. Quickly mounted
on the camera by its fixing device.
Electric H grip. Similarly designed, can be used for
releasing the different electric motors.
Auxiliary multifocal viewfinder, with bracket. Its
field can be instantly adjusted for focal lengths of 10-
16-25-35-50-63-75-100 and 150 mm. It is easily and
quickly mounted on the camera or removed for pre-
viewing a scene.