![]() ![]() Where f1 is focal length of objective lens and f2 is focal length of eyepiece. ![]() The first Alvarez pair represents objective lens of Galilean system, while second Alvarez pair represents an eyepiece lens. The core of our Alvarez zoom lens is an afocal Galilean system. General working principle of an Alvarez lens pair Paraxial model of an Alvarez Zoom lens Lateral shift of Alvarez lenses in each pair changes optical power of the Alvarez pair.įig 4. Alvarez pair (picture from As one can see in the picture below, each Alvarez pair represents an optical element with optical power variation. Each Alvarez lens is a free-form optical element with only one plain of symmetry.įig 3. To understand how Alvarez zoom works at first let’s look at Alvarez pairs. General representation of Alvarez Zoom and its comparison with Conventional Optical Zoom How Alvarez pairs work 1 Conventional Optical Zoom lens (left) and Alvarez Zoom lens (right)įig 2. Because of this feature Alvarez zoom can be really useful in slim applications like smart phones.įig. Main difference between conventional zoom lens and Alvarez zoom lens is that conventional system lenses are moving along optical axis while Alvarez system lenses are moving in a perpendicular direction to optical axis. In case of Alvarez Zoom Lens we have pairs of so called Alvarez lenses and the lateral shift of these lens elements with respect to each other provides variation of focal length of the optical system. We have several groups of lens elements in an optical system, which move along the optical axis along predefined trajectories providing variation of resulting focal length (zoom factor) of the optical system. One probably knows how traditional zoom lens works. A sample file is included.Īuthored By Ted Churlyaev, Vadim Vlakhko, Li Han Chan (DynaOptics LCC) DownloadsĪrticle Attachments What is Alvarez Zoom lens This article explains main principles of Alvarez Zoom lens and includes a demonstration of an Alvarez Zoom lens calculation and modeling in Zemax Optic Studio. Alvarez Zoom is an amazing optical system where optical zoom is provided by lateral shift of free-form lenses. ![]()
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