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Photo-Sonics, Inc. |
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The Photo-Sonics 35mm-4E
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 camera 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. The 35mm-4EL is a specialized model equipped with phase lock electronic speed control which allows several options in controlling one or more cameras. It can be used to position each camera shutter, through an external pulse, to a very precise point in time, allowing cameras at various sites of test range to run in synchronization. |
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| Another specialized model, the 35mm-4ER includes a Beamsplitter and Video Assist Assembly to allow the operator to view the subject being photographed. It is possible to obtain a stable picture when filming in a strong magnetic field, close to infrared range, or subject to a strong vibration or shock. Shooting can begin within one second after turning on the power. This camera model is only available through Photo-Sonics' Rental Department. | ||||||||||||||||||||||||||||||||||||
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| System Specifications | ||||||||||||||||||||||||||||||||||||
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| Film Data Recording | ||||||||||||||||||||||||||||||||||||
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The 35mm-4E can be equipped with an LED Matrix Recording Head that exposes externally-produced data, such as time, azimuth, elevation, and events on each frame of film in seven segment (2x20) or BCD (4x30) format placed between frame lines. Other formats are available per customer requirements. Smart analysis systems, such as the TrackEye, can decode this data while digitizing the film. The camera can also be equipped with Fiducial Markers which provide three mechanical reference marks (crows feet) that define the centerline of the frame to determine the location of the subject on each frame of film. The fiducial marks are recorded on the outside of the film frame. Two marks are positioned on each side of the film frame in the center and one mark is positioned on the bottom, in the center, of the film frame. Fiducial illumination intensity is adjustable to match film ASA. For referencing elapsed time, the 35mm-4E is equipped with a Timing Light Assembly to reference elapsed time or other coded information by placing timing marks on both edges of the film from the film edge to the inner edge of the perforation. Pulse signals for flashing the LED timing lights are received from either the shutter correlation pulse or an outside timing generator. The 35mm-4E Shutter Position Sensor Assembly utilizes the photo-electric system to indicate the instant the midpoint of the shutter opening coincides with the center of the aperture opening. The signals encoded are conditioned and transmitted to the receiving electronics for further processing and transmission to the control unit. A parallel circuit has been included to provide a differential line driver output to the LED matrix connector. The circuit signals the Film Data Recording System when the film is in the proper position for the LED matrix to be printed. |
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| Phase Lock | ||||||||||||||||||||||||||||||||||||
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The Phase Lock electronic 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 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 the shutters by some known degree . . . i.e., 60, 90, 120, or 180°, thereby providing continuous coverage. Phase locked cameras provide a unique method of verifying phase lock accuracy with an edge-of-film mark, representing 5° of shutter opening which is derived from a special shutter position sensor. The blank line in the middle of the mark represents the incoming phase lock reference frequencing, which gives the viewer a clear indication that the camera was phase locked with 5° of the incoming reference frequency |
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| Lenses | ||||||||||||||||||||||||||||||||||||
| The 35mm-4E uses a standard Photo-Sonics Bayonet Mount. Lenses with this type mount are available in a selection of commonly used focal lengths. Click here to see details on our full range of lenses. | ||||||||||||||||||||||||||||||||||||
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| Reflex Viewing | ||||||||||||||||||||||||||||||||||||
| The 35mm-4ER Camera is available through the Photo-Sonics' Rental Department. The reflex viewer is an integral part of the camera door and video assist assembly and provides for boresight aligning, focusing and viewing during filming. By interposing a built-in, retractable mirror between the camera lens and the film, a full view of the lens is visible to the operator through the image-forming optics and is right side up with the image correct from left to right. The video assist unit allows the operator to view the subject being photographed on a monitor. The built-in, miniature video camera utilizes a solid state image sensor to obtain precise image geometry while monitoring moving objects or those in strong light. | ||||||||||||||||||||||||||||||||||||
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| Auto-Collimation Reticle | ||||||||||||||||||||||||||||||||||||
| An Auto-Collimation Reticle is available to determine infinity setting of long focal 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. | ||||||||||||||||||||||||||||||||||||
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| Magazines | ||||||||||||||||||||||||||||||||||||
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The
500-Foot and 1000-Foot Magazines
are designed to handle film on darkroom loading cores. The film
magazine can be changed quickly to allow nearly continuous filming
by removal of an expended magazine and replacement with a fully
loaded one. After reasonable familiarization with the equipment,
many operators routinely remove a magazine and install a replacement
in five seconds. Reloading can also occur in less than one minute.
In addition to the ease and speed of reloading or replacing the separate magazine, the design concept has other distinct advantages for the user. When cameras are used in the same application for several occasions, daily installation and removal of only the magazine takes care of supplying fresh film and recovering exposed film, while the camera body and lens remain undisturbed in their installed location. The mechanical settings are untouched, the camera control settings are preserved, and the electrical connection is unbroken. |
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© 2008 Photo-Sonics, Inc. |
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