![]() The lens system according to the present invention comprises seven lensĮlements arranged in six components, i.e., a first positive meniscus lens,Ī second positive meniscus lens, a third negative meniscus lens, a fourthĬemented doublet lens consisting of a negative lens and a positive lens, aįifth positive meniscus lens and a sixth positive lens. Wherein f 5, f 6 and f 7 represent focal lengths of said convex Lens elements located on the image side so as to meet the following Various aberrations are favourably corrected by designing the three convex To provide a compact variant type of Gauss photographic lens in which In view of the foregoing, it is a general object of the present invention To eliminate flare though it is effective for minimizing spherical However, this condition is never advantageous Wherein f 5, f 6 and f 7 denote focal lengths of the convex In such types of lenses, sphericalĪberration is minimized by designing the three convex lens elements on the However, such variants and improved types of Gauss lens still have theĪbove-mentioned defact of Gauss lens. Nearest the image side into two lens elements. Two lenses and functioning as a lens) and by splitting the lens located Second cemented-truplet component with an air lens (space located between Relative apertures by replacing the intermediate lens element of the This type of lens has subsequently been developed into ones having larger Simlar, which is an intermediate type between Sonner and Summar, is known With a view to solving this problem, there have heretoforeīeen designed numerous variants of Gauss lens and, of such variants, Said spherical aberration on the concave surface for rays at intermediateįield angles. In Gauss lens, the concave surface located immediately after the stopįunctions to produce spherical aberration, which has conventionally posedĪ problem to favourably correct the coma caused due to over-correction of Which has a relative aperture of 1 : 1.4 and a field angle of aboutĤ5° and which is intended for use with 35 mm single-lens reflex The present invention relates to a variant type of Gauss photographic lens A compact lens system having a long back focal length and a large relative aperture comprising a first positive meniscus lens, a second positive meniscus lens, a third negative meniscus lens, a fourth cemented doublet lens component consisting of a negative lens element and a positive lens element, a fifth positive meniscus lens and a sixth positive lens and having following numerical data: A compact lens system having a long back focal length and a large relative aperture comprising a first positive meniscus lens, a second positive meniscus lens, a third negative meniscus lens, a fourth cemented doublet lens component consisting of a negative lens element and a positive lens element, a fifth positive meniscus lens and a sixth positive lens and having following numerical data:ģ. ![]()
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March 2023
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