Back to results
US 6,606,205 B2Granted
Converter
AssigneeFuji Photo Optical Co., Ltd.
InventorYoshitaka Mori
Life of this patent
Estimating the term…
Abstract
An auxiliary lens with which lenses are held within a mount has an afocal magnification of 0.8 and serves as a wide-angle conversion lens when attached to the front face of a taking lens with a small aperture. On the other hand, when attached to the front face of a taking lens with a large aperture, the auxiliary lens serves as a ratio conversion lens for an aspect ratio switchable camera which can switch an aspect ratio of the imaging area from 16:9 to 4:3.
Claims4
A converter comprising:
- an auxiliary lens that changes focal lengths of a first taking lens and a second taking lens wherein the second taking lens having a larger diameter than the first taking lens;
- and
- an attaching device that attaches and detaching said auxiliary lens to and from a subject side of said first taking lens and said second taking lens, wherein
- said auxiliary lens serves as a wide-angle conversion lens that reduces an image by expanding a view angle and at the same time forming the image without vignetting within an imaging area when the auxiliary lens is inserted into an optical system of said first taking lens, and
- said auxiliary lens serves as a ratio conversion lens that reduces the image by expanding the view angle and at the same time forming the image within the reduced imaging area, the image having the view angle with almost the same size as the original imaging area in a case where the imaging area is reduced in relation to an aspect ratio of the imaging area, when the auxiliary lens is inserted into an optical system of said second taking lens.
2 more elements
Dependencies are inferred from the claim text.