Geometrical instruments – Straight-line light ray type – Multisight line
Patent
1979-10-05
1981-11-24
Haroian, Harry N.
Geometrical instruments
Straight-line light ray type
Multisight line
G01C 300
Patent
active
043015999
ABSTRACT:
A device is provided for previewing the field of view of an optical lens, for use in still, motion picture or video photography. The device includes a fixed member having an aperture therein and a movable member. The movable member adjusts the size of the aperture in the fixed member. The device further includes a spacer for spacing the user's eye away from the aperture. The fixed member includes a series of openings and the movable member carries indicia which are selectively viewable through said openings, depending on the position of the movable member. The indicia then exposed indicate the focal length of the appropriate lens to be used in order to cover the field of view represented by the selected aperture.
REFERENCES:
patent: 665615 (1901-01-01), Mellen
patent: 685839 (1901-11-01), Heger
patent: 940504 (1909-11-01), Brayton
patent: 2702944 (1955-03-01), Lane et al.
Haroian Harry N.
Imero Fiorentino Associates, Inc.
LandOfFree
Lens previewer does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Lens previewer, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Lens previewer will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2168221