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6 to 360 Frames Per Second Cine
25 to 250 Frames Per Second Phase Lock
Frame Rate Stability of .005%
+/-.002" Frame-to-Frame Accuracy
Built-in Reflex Viewing
Self-Calibrating
Enhanced Safety Features

The Photo-Sonics 35mm-4EL Instrumentation Camera has been a workhorse at military and commercial test facilities for decades. In worldwide applications, its durability and high reliability are a matter of record.
With its new Integrated Electronic Management System, the 4EL provides a high-resolution, film recording platform that not only simplifies operation, but further enhances reliability and eases the task of today's sophisticated data collection requirements.

FILM MOVEMENT
The 4EL operates in cine from 6 to 360 fps and in phase lock from 25 to 250 fps. The heart of the camera is its advanced precision film transport mechanism. Unlike any other 35mm camera in the world, the 4EL has 12 pulldown arms, 4 register pins and a vacuum-assisted gate, all contributing to superior registration and resolution. The film transport can be removed without the use of tools in less than 30 seconds for maintenance, and is interchangeable from camera to camera.

CAMERA FEATURES
The 4EL accepts either 500- or 1000-foot quick-change, darkroom loaded film magazines. A standard reflex viewing system provides a correctly-oriented full frame field-of-view image for focusing and boresighting. The viewer includes a control to select 5- or 20-power magnification. An adjustable rotary disc shutter can set shutter openings

in 5 degree increments between 5 and 50 degrees or in 10 degree increments between 50 and 120 degrees. A five-digit footage counter automatically measures film advancement in 10 foot increments. The camera also has an interlock system to ensure that a number of conditions have been met for proper film recording before the camera can be operated. These safety features include two buckle switches, and a complete fault detection system

CONTROLS / INDICATORS

Controls/Indicators are conveniently located on a simple side-mounted panel. They include:

AC power disconnect and circuit breaker
Cine/Phase lock mode control switch
Cine frame rate select switch
Camera run-stop-test select switch
Inside and outside edge-of-film timing light control switches
Illuminated fiducial intensity control
Optional illuminated boresight ground glass or illuminated auto-collimation reticle control
Power status indicator
Mid-Shutter correlation indicator
Cine ready indicator
Phase lock ready indicator
Phase lock reference valid indicator
Phase lock 5 degree status indicator

DATA RECORDING
Diagram of film clip with marks will be added soon

The 4EL can be equipped with an LED matrix recording head that exposes externally produced data on each frame of film in seven segment (2x20) format or binary (4x30) format (see diagram above). Other formats are available per customer requirements.

The camera can also be equipped with fiducial markers which provide three reference marks on each frame of film which define the center line of the frame (see diagram above). Fiducial illumination intensity is adjustable to match film ASA.

For referencing elapsed time, the 4EL is equipped with a timing light assembly consisting of two LED's each positioned to expose a mark on its respective edge of film through a thin slit in a mask plate (see diagram above).

An auto-collimation reticle is available to determine infinity setting of long focal range length lenses. The reticle is adjustably illuminated and is fitted with a point light source in the center which projects a pattern in the film plane forward into the lens. The beam is then reflected by a flat mirror (auto-collimation mirror) placed in front of the lens and returns upon itself to re-image on the ground glass at the film plane.

The 4EL comes standard with shutter correlation pulse assembly which utilizes the photo-electric system to indicate the instant the midpoint of the shutter opening coincides with the center of the aperture opening.

PHASE LOCK

The phase lock electronics speed control allows synchronizing the operation of multiple recording cameras at various sites during mission tracking.

The servo electronics synchronize the midpoint of the camera shutter opening to the leading edge of an external reference frequency (derived from IRIG or other timing standard). In multiple camera operations, the system is used to position each camera's shutter, through an external pulse, to a very precise point in time, allowing the cameras to run in synchronization. In addition, by electrically phase shifting the reference pulse at multiple sites, it is possible to shift shutters by some known degree…i.e. 60, 90, 120, or 180 degrees, there by providing continuous coverage.

Phase locked cameras provide a unique method of verifying phase lock accuracy with an edge-of-film mark (see data recording diagram). The mark , representing 5 degrees of shutter opening, is derived from a special shutter position sensor. The blank line in the middle of the mark represents the incoming phase lock reference frequency, which gives the viewer a clear indication that the camera was phase locked within 5 degrees of the incoming reference frequency.

FAULT DETECTION

Primary consideration is given to operator and equipment safety. Key parameters are continuously checked, and only when certain conditions have been met is the camera allowed to start operation. In the event of a fault condition, arbitration logic determines what action should be taken. Two of the fault detection parameters are configurable to customer parameters.

Aperture Size:
Film Transport:
Adjustable Shutter:

Film Specifications:

Film Capacity:
Mounting:
Film Cores:
Weight:
0.724 x 0.986 inches (std)
0.600 x 0.986 inches (with LED matrix)
Intermittent with 12 pulldown arms and 4 register pins
Rotary disc type with following adjustments
5 degree increments between 5 and 50 degrees 10 degrees between 50 and 120 degrees
B & H .1866 USA PH 22.93-1953
B & H .1870 USA PH 22.34-1964
KS .1870 USA PH 22.36-1964
500 and 1000 ft darkroom-loaded magazine
Base
2-inch plastic film cores or 4-inch dynamically- balanced aluminum cores.
125 lbs. (with 1000-ft magazine