ARRI ARRIFLEX 16S, Руководство по эксплуатации

Страница: 13 / 22

Registration Pin
With the film gate opened, the registration pin can be seen just above the
transport claw. Its function is to locate the film precisely and to hold it in place
during the moment of exposure. The registration pin ensures rock-steady
pictures, a repetitively precise film line, and increased tolerance against film pitch
changes.
Never force the registration pin in any way while cleaning the
gate, only activate it by turning the motor inching knob [27].
Film Transport Claw
The film transport claw engages the film from the front, the emulsion side. Watch
its action by turning the inching knob (27) and note that it engages the film while
the registration pin is lifting out of the perforation. This way, during the entire
frame cycle, there is always one claw engaged for positive control of film.
Mirror Reflex Shutter
The mirror reflex shutter is the heart of
the Arriflex reflex system. It rotates at a
45° angle between lens and film plane
and reflects to the ground glass of the
viewfinder exactly the same image as is
registered on the film. All of the light rays
reach the film through the lens without
any interference while the shutter is
open, and are alternately reflected to the
ground glass only while the shutter is
closed. Thus the film, as well as the eye,
always gets 100% of the light transmitted
by the taking lens.
The effective shutter opening is 180° and
gives the following exposure times at
various speeds:
8 FPS – 1/16 sec. 12 FPS – 1/24 sec. 16 FPS – 1/32 sec.
24 FPS – 1/48 sec. 32 FPS – 1/64 sec. 48 FPS – 1/96 sec.
As this table indicates, the exposure can be calculated for the camera speed by
doubling the FPS figure and reading the result as a fraction of a second (180°
shutter only).
Tripod Sockets
Two tripod threads, one 1/4" and one 3/8" size, are provided in the bottom of
camera housing. This socket is made of tool steel and is a replaceable insert in
the aluminum camera housing.
Many standard tripod screws might be too long and trigger the built-in
switch for the pistol grip. An excessively long tripod screw could even
damage the switch housing inside the camera. The standard length for
tripod screw is 7mm = 0.280 inches.