Wide-Angle Lens Adapter

 

Wide-Angle Lens Adapter

 

U.S. Pat. 7,460,777

      This lens adapter was invented by Steve Hines for wide-angle covert photography through a small opening.  The device can be improvised using a plastic tube, then discarded drawing little attention if found.  The tube is an afocal adapter and can be used with any camera or format.  

Wide-Angle-Adapter-01-anim

      The wide-angle adapter can be any cylindrical tube, with a shiny inner surface.  The camera photographs the view directly through the hole, and the multiple reflections inside the tube.  Alternate circular images, starting with the open-hole, are erect and right reading.  Alternate odd-numbered reflections (first, third, fifth, etc.) appear to be rotated 180°.


Wide-Angle-Adapter-02-thru-tube-anim
      Uncorrected video segment shot through tube showing a car passing from right to left across the camera's field of view.
      The angle of view is dependent only on the lens coverage, therefore a wide-angle lens really benefits from the optical properties of the tube.. A clear Plexiglas tube, painted black outside or wrapped with black tape, is reflective enough near grazing incidence to reflect images 3 – 5X wider than the field of view of the open hole.Image quality in the reflected rings is greatly dependent on the internal surface quality, and accurate centering of the tube.

Wide-Angle-Adapter-03-WP-gray-anim

      If a scene is viewed through a hole in a wall, the field of view is restricted by the hole.  When the scene is viewed, or photographed, through a polished tube, wider parts of the scene can be seen in the reflections.  Alternate bands of reflections are upside down, and reversed left to right.  These reflected rings can be rotated 180° using Photoshop or dedicated software.

      The photographer may get the illusion that the tube is transparent in the 2nd and 4th reflections.  


 

Increased coverage using Hines' Covert Wide-Angle Adapter

Image Order Image-Diameter increase (Field of View) Image Area increrase = (image dia.) x 2
"0", zero order (open hole) 1X (reference) 1X (reference)
1st reflection* (must be rotated) 3X 9X
2nd reflection 5X 25X
3rd reflection* (must be rotated) 7X 49X
4th reflection 9X 81X
Nth reflection (this list can be expanded, however the image quality falls off with each reflection in the tube) – – – – – –

*Note, all odd-numbered reflections must be rotated.  Even numbered reflections do not require rotation.


This adapter is intended for legal surveillance work and intelligence gathering only.


 

Hines' original lab notebook entries for this invention:

Wide-Angle-Adapter-Notebook-p132-100p Wide-Angle-Adapter-notebook-p133-100p

 

      This patented wide-angle camera adapter technology (U.S. Pat. 7,460,777) is available for license.  For more information, please contact Steve Hines at:

HinesLab, Inc.

Glendale, California, USA

email: Steve@HinesLab.com

Phone: 818-507-5812