The Achromatic Lens System

The present invention relates to an achromatic lens system which is to be used in

optical systems for telescopes, microscopes, cameras, video cameras, etc., and an image pickup lens system which comprises an achromatic lens system.

An optical system which is to be used in telescopes, microscopes, cameras, video cameras, etc. generally has a composition in which a large numbers of lenses are combined for enhancing optical performance of the optical system. A cemented achromatic lenses which is referred to as an achromat is frequently used in optical system for correcting chromatic aberration in particular. This achromat corrects chromatic aberration ordinarily for rays having two wavelengths such as the C-line and the F-line, but does not strictly correct chromatic aberration for rays having different wavelengths such as the g-line, thereby allowing chromatic aberration which is referred to as the so-called secondary spectrum to remain. This residual chromatic aberration often poses problems in objective lens systems for telescopes and microscopes as well as telephoto lens systems for cameras and so on in particular, and a lens system which is made achromatic for three wavelengths and is referred to as an apochromat is used for correcting the residual chromatic aberration.

Whether you're using it for school, work or a hobby, a microscope is a significant investment. It is important to find a microscope that will deliver exceptional performance, be easy to use and last for many years. Anything less is a waste of your time and money. As such, you'll want to learn just how to shop for a microscope.

Look for microscopes made of metal or a metal alloy. These microscopes are usually quite sturdy and last the longest.

Choose fluorescent lighting over incandescent. Fluorescent lighting is not nearly as hot as light from an incandescent bulb. The heat from incandescent lighting can sometimes kill small organisms on a slide.

A primary object of the present invention is to provide an achromatic lens system which elaborately corrects the secondary spectrum of chromatic aberration with a small number of optical elements.

The achromatic lens manufacturer according to the present invention comprises a radial type gradient index lens (radial type GRIN lens) whose refractive index varies in a direction perpendicular to an optical axis and a diffraction type optical element (diffraction type lens), and is characterized in that it satisfies the following condition (1): 0.1< e1gF

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