Shirt-Pocket Movie Camera

 

Shirt-Pocket Sound Movie Camera

Smaller and lighter than any other 8mm movie camera, sound or silent.

      A continuous-motion, non-intermittent shirt-pocket sound movie camera developed by Steve Hines at the Kodak Research Laboratories in 1976.  The design goal was to develop an automatic, pocketable movie camera to encourage filmmaking.  


 

The 5-oz. shirt-pocket sound movie camera beside the 3-lb. Kodak Ektasound 130, the smallest sound movie camera available at the time.


 

The smallest 8mm movie cameras available in 1976:

 
  Hines / Kodak shirt-pocket experimental Kodak Ektasound 130 Agfa Microflex Sensor Fujica P1 Bolsey 8
Film format frame size of Super 8 Super 8 sound Super 8 Single 8

Standard 8 magazine

Run time- min. 3-1/3 3-1/3 3-1/3 3-1/3 2
Frame rate 15 fps 18 fps 18 fps 18 fps

16 fps

Shutter angle 360° * 230° 180° 160° ≈ 150°
Duty cycle 100% 63% 50% 44% ≈ 42%
Weight, grams 142 1250 500 530 400
Volume, cu. in. 10.4 180 31.5 31.5 11.1
Camera operating noise virtually silent, similar to a tape recorder usual chatter of intermittent film pull down usual chatter of intermittent film pull down usual chatter of intermittent film pull down usual chatter of intermittent film pull down
Microphone built in external

 

      *The shirt-pocket camera does not use the typical blocking shutter.  When running, the camera is always exposing frames.  An optical differential causes the image to chase continuously-moving film, giving the the equivalent shutter angle of 360°.  

      The pocket camera uses 8mm-wide, thin-base, mag-striped film.  Instead of the film being perforated, the camera exposes optical fiducial marks beside each frame, used later for registration by the projector or video-film player.  

      Because the film moves continuously, there is no need for the sound recording head to be displaced from the gate as in Super 8 cameras.  In the pocket camera, the sound-recording head is positioned beside the camera gate.  If the film is edited, there is no time gap between the picture and sound.  


 

      The concept for this continuous-motion camera was first tested by building a Super 8 projector, with the identical optical differential.  In spite of the relatively low 15-fps frame rate the image does not flicker because there is no rotating shutter to block light.  For the first time, viewers can watch movies without the noise of the intermittent film pull down.  The only sound is from the movie sound track.  Following the proof-of-concept projector, the pocket camera was developed from clean paper to working camera in 9 months.  

      Movies from the camera are viewed on a television using a Kodak VP-1 video film player, therefore the use of "Video" in the original name, although a film projector for this format is equally viable.  Originally conceived as a consumer camera, however the small size and near-silent film movement makes it useful as a covert spy camera.  



      The size is minimized by attaching the film and battery cartridges to the outside of the camera to complete the form, rather than being inserted inside a larger camera.  The quiet-running film transport allows the microphone to be built in.  


 

      The pocket movie camera with film cartridge and battery removed, showing capstan drive, film take-up sprocket, taking lens, shutter release, viewfinder opening, viewfinder focus, film gate, and sound-recording head.         The battery, shutter-release, flywheel, taking lens, optical differential, motor, speed regulator, fiber-optic viewfinder, microphone, and sound amplifier on folded flex circuit.         The fiber-optic viewfinder, twisted 180° to create erect image for the eyepiece, shifted vertically and laterally to clear other components in the camera and to place the eyepiece on center of the camera body.  

 

 Technical Specifications:‚Äč

  • Size:  fits in shirt pocket  (the size of a Super 8 sound film cartridge).
  • Weight:  5 oz.  (420 grams).
  • Sound:  Built-in microphone, automatic gain control.
  • Taking Lens:  10mm FL, ƒ3.5.
  • Film load:  3-1/3 min.
  • Frame rate:  15 fps.
  • Film type:  un-perforated, 8mm mag-striped, thin base.
  • The film being unperforated, eliminates cost.
  • Shutter angle:  360°.
  • Exposure:  automatic.
  • Viewfinder:  117,000-fiber-optic image bundle.
  • Eyepiece:  focusable.
  • Film type and ASA:  keyed to camera by film cartridge.
  • Operating noise level:  similar to a pocket cassette recorder (nearly silent).

 

      In comparison to today's digital cameras and smartphones, this pocket movie camera may not seem that small; however, to put this in the context of 1976, this camera was developed when:  

  • TV news was shot on 16mm B/W film.
  • 6 years before music CD’s.
  • 7 years before the personal computer.
  • 8 years before the first 8mm camcorder.
  • 19 years before GPS navigation in cars.
  • 31 years before the iPhone.

 

      During the 9 months of the pocket camera's development, competing B/W video cameras and shoulder-strap reel-reel recorders were coming to the market.  As a further hurdle, the pocket camera required a new film format, new projectors or video film players, etc.  Interest in video had become too strong to create this new film format.  

      Once Kodak business confidential, this technology by agreement between Eastman Kodak and HinesLab is available for license from HinesLab.  It also serves as an example of technology which can be developed for clients of HinesLab on a contract basis.  For any questions, please contact Steve Hines at:

HinesLab, Inc.

Glendale, California, USA

email: Steve@HinesLab.com

Phone:  818-507-5812