1. Field
Apparatuses consistent with exemplary embodiments relate to a thin telephoto lens and an image pickup apparatus including the same, and more particularly, to a telephoto lens that is thin enough to be used in a mobile device and an image pickup apparatus including the thin telephoto lens.
2. Description of the Related Art
A zoom lens including a refractive optical system is usually long and heavy, and a length of such zoom lens changes while a focal length is adjusted, and thus it is difficult to mount an optical zoom lens in a very thin mobile device such as a mobile phone. Recently, zoom lenses of various forms that are thin and have a minimized volume have been suggested, but the suggested zoom lenses are not yet compact enough to be used in a mobile device. Moreover, an F-number of the zoom lenses is increased, and the increased F-number may darken images. Due to this reason, a fixed focus lens is still typically used in a mobile device.
However, a fixed focus lens has a fixed angle of view, and thus, it is difficult to create diverse effects when capturing an image using the fixed focus lens. In particular, a camera for mobile devices is generally designed to be suitable for short-range photographing, and thus may not be suitable for long-distance photographing. Accordingly, instead of using a zoom lens, two fixed focus lenses, that is, a wide-angle lens and a telephoto lens have been recently used together to provide zoom effects.