| 摘要 |
An anamorphic lens attachments to be used in conjunction with a basis lens. The attachment provides a variable anamorphic ratio. The attachment comprises a first lens group (106) having positive refractive power in a first direction (104), a second lens group (108) having negative refractive power in the first direction, and a third lens group (110) having positive refractive power in the first direction. The three lens groups lying on the same axis (220), which is perpendicular to the optical axis (102). The second lens group is movably located between the first lens group and the basic lens. The third lens group is located between the second lens group and the basic lens at a fixed distance from the first lens group. The lens groups of the attachment have neutral refractive power in a second direction substantially perpendicular to the first direction.
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