Abstract: An apparatus for forming an image has one or more lenses in an optical path, at least one angular-sensitive light transmission filter in the optical path, in which transmission varies with change in angular orientation of the filter with reference to the direction of light in the optical path, and a mechanism for adjusting the angle of the light transmission filter.

Abstract: A color-filtering device for enhancing color from a binocular view includes a first variable color filter element a second variable color filter element: and a mechanical assembly for communication of axial rotation to the first and second filter elements.

Abstract: An apparatus for forming an image has one or more lenses in an optical path, at least one angular-sensitive light transmission filter in the optical path, in which transmission varies with change in angular orientation of the filter with reference to the direction of light in the optical path, and a mechanism for adjusting the angle of the light transmission filter.

Abstract: An apparatus for forming an image has one or more lenses in an optical path, at least one angular-sensitive light transmission filter in the optical path, in which transmission varies with change in angular orientation of the filter with reference to the direction of light in the optical path, and a mechanism for adjusting the angle of the light transmission filter.

Abstract: A color-filtering device for enhancing color from a binocular view includes a first variable color filter element a second variable color filter element: and a mechanical assembly for communication of axial rotation to the first and second filter elements.

Abstract: A color-filtering device for enhancing color from a binocular view includes a first variable color filter element a second variable color filter element: and a mechanical assembly for communication of axial rotation to the first and second filter elements.

Abstract: An apparatus for forming an image has one or more lenses in an optical path, at least one angular-sensitive light transmission filter in the optical path, in which transmission varies with change in angular orientation of the filter with reference to the direction of light in the optical path, and a mechanism for adjusting the angle of the light transmission filter.

Abstract: A color-filtering device for enhancing color from a binocular view includes a first variable color filter element a second variable color filter element: and a mechanical assembly for communication of axial rotation to the first and second filter elements.

Abstract: A helmet-mounted wireless frequency-modulated infrared beam-actuated auxiliary brakelight system capable of reliable operation in all ranges of ambient light while permitting the rider to turn his head from side to side over a large angle approaching 180 degrees or more. The system comprises a frequency-modulated infrared transmitter, in operative combination with a switch for detecting brake system actuation, and a helmet module, including a frequency-modulated infrared receiver and decoder in operative combination with a stop light. Brake system initiation results in switch actuation which causes the transmitter to emit a beam of frequency-modulated infrared energy towards the helmet module. When the beam is received at the helmet module, it is captured using a lens in operative combination with a novel lightpipe which ensures reception over a 180 degree angle.