Abstract: An optical magnifier suitable for viewing microdisplay panels and other optical fields and providing a wide field of view with minimal aberrations across the field over a large pupil with long eye-relief. The magnifier comprises six lens elements formed without the use of expensive very high dispersion glass. The lens surfaces are spherical and/or flat thereby simplifying lens fabrication. A similar magnifier with fewer lens elements configured to view a concave image surface is also disclosed.

Abstract: An optical macro adaptor assembly comprising two or more lens components arranged successively along the optical axis thereof, configured to be mounted in front of the objective lens of a telescope, and acting to reduce the minimum focus distance of the telescope to permit the telescope to be used in environments requiring a close focus. The optical macro assembly can be a Galilean-type optical system of approximately unit magnification with adjustable spacing between the lens elements to allow for focusing.

Abstract: An optical magnifier suitable for viewing microdisplay panels and other optical fields and providing a wide field of view with minimal aberrations across the field over a large pupil with long eye-relief. The magnifier comprises six lens elements formed without the use of expensive very high dispersion glass and where the lens surfaces are spherical and/or flat. More specifically, from an eye side to object side, the magnifier has a plano-convex lens having a convex eye side surface, a negative meniscus lens with a concave surface on the eye side, a doublet having a concave eye side surface, an internal surface concave from the object side, and convex surface on the object side, a bi-convex lens, a doublet with a convex eye side surface, an internal surface convex from the object side and a flat object side surface, and a bi-concave lens. A magnifier with fewer lens elements configured to view a concave image surface is also disclosed.

Abstract: An optical macro adaptor assembly comprising two or more lens components arranged successively along the optical axis thereof, configured to be mounted in front of the objective lens of a telescope, and acting to reduce the minimum focus distance of the telescope to permit the telescope to be used in environments requiring a close focus. The optical macro assembly can be a Galilean-type optical system of approximately unit magnification with adjustable spacing between the lens elements to allow for focusing.

Abstract: An apparatus or system for limiting access to control of electrically operated equipment. In order to access control of the equipment, i.e., to activate or deactivate the equipment, an operator must enter an access code for example by working a predetermined number of switches or code. An additional feature of the system includes a dwell time function to allow access to control the equipment for a limited time after deactivation.

Abstract: A finder or sighting scope for use with an astronomical telescope, the finder scope having a target member or reticle located at the common focus of the scope objective and the eyepiece. The target member or reticle may be seen as a magnified telescope view when viewed through the eyepiece and as a target or star image against the backdrop of the sky as viewed by a naked eye, the target or star image being projected into the viewer's line of sight by the objective and a mirror and beamsplitter.

Abstract: Ultra wide-angle eyepieces with relatively long focal lengths and minimal spherical aberration of the exit pupil and field curvature. The eyepieces use six elements in a positive power lens group and two elements in a negative power lens group.

Abstract: A wide angle eyepiece having reduced astigmatism at the edge of the field and comprising a doublet, a singlet, a singlet, and a doublet, wherein the doublets have negative power.

Abstract: A Plossl type eyepiece for astronomical instruments in which the external flint elements of the symmetrical achromatic doublets are double concave elements.

Abstract: A multi-purpose telescope objective having a Petzval type lens configuration and including an iris diaphragm.

Abstract: A wide angle eyepiece having a 90.degree. field of view, a field curvature of at least 15.06 F, and minimal astigmatism.