BOLEX H16 REFLEX User Manual - Page 3

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There are at least seven models of modern Bolexes: The H-16, M-5, RX-5, SB, EBM,

and the EL. Excluding the H-16 and the M-5, all have Reflex Viewfinder systems,

so you see approximately what you shoot. These reflex systems divert approximately

30% of the light that passes through the lens. As a result you must compensate for

this light loss by opening up your lens 1/3 stop from your calculated exposure.

The H-16 and the M-5 can mount a single "C" mount lens. The RX-5 features

a triple "C" mount lens turret. This allows you to quickly rotate between lenses to

change your focal length (Very handy for Documentary and Live-Action, not so

necessary for Animation). The SB, SBM, EBM and EL have a single Bayonet lens

mount. This is advantageous if you are using lenses with long focal lengths as the

Bayonet mount is structurally stronger. In addition, a "C" mount to Bayonet

adapter is available.

All models except the EBM and the EL have a spring-wound motor. The

maximum run-time of the camera is approximately 28 seconds. This is about 16 feet

(40 frames/ foot.). All cameras have speeds of 12, 16, 18, 24, 32, 48, and 64 fps. In

addition, the cameras can be set to take single frames, either at a default shutter

speed or a timed exposure. An assortment of wild, crystal controlled and animation

motors can be fitted to the cameras. The EBM and the EL have an integrated 12 volt

camera motor.

With the exception of the M-5, each camera can has a slot behind the lens for

inserting gelatin filters. To prevent stray light leakage, the RX-5 must always have

its gelatin filter holder inserted into the slot. Even if there is no filter in it. The SB,

SBM, and EL models have a more advanced design that provides a two position

filter slot. Therefore a loaded filter holder can be mounted in the filter slot in

anticipation of its use. To use the filter, it is simply advanced to its second position

behind the lens.

All models take 100 ft daylight spools or cores. Some models are adapted to

take an external magazine, extending the capacity to 400 ft. 100 ft. of 16mm will give

you two minutes and fourty-four seconds of screen time.

Most models have a variable shutter. This allows the operator to further

reduce the exposure time of the shutter. It can also be used to create in-camera fades

and dissolves. (Note: these times take into account the 1/3 stop compensation)

Variable shutter shutter speeds

In Animation, the shutter speed is a combination of the motor speed and the size of

the Variable shutter.

THE BOLEX

Shutter speed of EBM and EL at 24 fps — 1/67 sec

Shutter speed of spring wound Bolexes at 24 fps 1/80 sec

At 24 fps shutter one quarter closed —1/112 sec

At 24 fps shutter half closed — 1/188 sec