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Category:2006 video games
Category:Video games developed in Germany
Category:Citrix Online games
Category:Strategy video games
Category:City bus (transport)
Category:Bus simulation video games1. Field of the Invention
The present invention relates to a zoom lens system of a rear focus type comprising at least four lenses in order from the object side to the image side: a negative, a positive, a positive and a negative lens.
2. Description of Related Art
In recent years, a lot of camera-attached zoom lens systems of a rear focus type comprising at least four lenses in order from the object side to the image side: a negative, a positive, a positive and a negative lens have been spread rapidly. Such zoom lens systems of a rear focus type are employed in a single-lens reflex camera, a video camera, a digital still camera, a camera-attached lens or the like because the number of lenses is small, the length of the lens system is small and the size of the lens system can be decreased.
A positive lens located on the most image side (rear) tends to be telecentric so that a defocus of an image plane on the object side is not enlarged. Accordingly, it is preferred that a state in which an aperture stop is located on the object side of the positive lens is set when the focusing is carried out. That is, the following condition is satisfied.f/ƒ≧1.0 (1)
Here, “f” is a focal length of the overall lens system of the rear focus type, and “ƒ” is a focal length of the positive lens.
Japanese Patent Publication No. 3425881 discloses a wide-angle zoom lens system having a wide angle from the object side to the image side, of which the overall length of the lens system does not exceed 4.0 mm and whose F-number does not exceed 1.4.
However, the wide-angle zoom lens system disclosed in the aforementioned publication has a long back focal distance, a large amount of aberration in a peripheral area and an insufficient telecentricity.
Meanwhile, the telecentricity of the positive lens located on the object side tends to be insufficient. If an angular aperture of the entire lens system is increased, an amount of the aberration of the