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LENS HOODS CINEMATOGRAPHIC APPARATUS
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Technical Examples
- A lens apparatus is disclosed, which allows an optical adjustment of each lens unit, and facilitates the assembly and maintenance. The lens apparatus comprises a plurality of lens units constituting an image-forming optical system that forms an object image, and a plurality of lens-holding members holding the plurality of lens units, respectively. Each of the lens units and the lens-holding member holding the lens unit are unitized. The lens apparatus is formed by joining each of the plurality of lens-holding members to at least one of the other lens-holding members.
- A lens edger which is capable of measuring the curvature of an eyeglass lens is disclosed. The lens edger includes a carriage which rotatably fixes a pair of lens fixing shafts and moves the position of the lens fixing shafts clamping a lens to be processed; a lens rotation motor for rotating the lens fixing shafts; a carriage driving means for moving the carriage; and an apparatus for measuring a curvature of the lens. The apparatus for measuring lens curvature includes a curvature tracer which contacts with a side of the lens and detects a curvature of the lens by moving horizontally according to the curvature of the lens during a rotation of the lens; a curvature tracer rotator which rotates the curvature tracer to a position for measuring the lens curvature, and to which one end of the curvature tracer is inserted in a manner of allowing sliding movement of the curvature tracer in a horizontal direction; and a slider base which guides the movement of the curvature tracer in the horizontal direction, and provides a restoring force to the curvature tracer so that the lens and the curvature tracer can be maintained in a contacted state.
- By reducing the outer diameter, increasing the overall length, and correcting chromatic aberration well, the invention realizes an objective optical system and examination apparatus that are suitable for in-vivo examination with a sufficiently increased length and widened observation range. The invention provides a compact objective optical system and an examination apparatus comprising, in order from an object side: a first lens group having positive power; a second lens group including a compound lens; a third lens group formed of a biconvex lens; a fourth lens group having positive power and including a compound lens; and a fifth lens group having positive power. Joining surfaces of the compound lens included in the second lens group and the compound lens included in the fourth lens group have negative power.
- An apparatus includes a body accommodating an imaging plane, and a lens device providing a light beam path and including lens units arranged along and coaxially with the path. The second lens unit next to the most outwardly located first lens unit is reciprocally rotational between a first position, at which the second lens unit is coaxial with the path, and a second position, at which the second lens unit is positioned away from the path. The first lens unit is provided on a cylindrical unit and is reciprocally movable with the cylindrical unit along the optical axis, and is moved to approach the plane while the second lens unit is in the second position to shorten a distance between the first lens unit and the plane in comparison with the distance between the first lens unit and the plane when the second lens unit is in the first position.
- An image pickup apparatus is provided. The image pickup apparatus permitting a conversion lens to be mounted and dismounted, wherein a lens hood is composed of a base portion on the mounting side and a tubular portion on the front side, the base portion and the tubular portion are detachably coupled to each other, and another lens is contained in the inside of the lens hood when the another lens is mounted on the front side of an optical system, whereby even when the conversion lens is being used, the lens hood can be used as it is, and the incident light contracting function of the lens hood can be maintained.
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