SU1691806A1 - Photographic objective - Google Patents

Abstract

FIELD: optical instrumentation; used in cameras like Zenith. The purpose of the invention is to improve the image quality and luminosity. The lens contains four components. The first component is a positive meniscus 1, the second and third components are negative menisci facing concavity towards the aperture diaphragm 7, while the second component consists of glued positive 2 and negative 3 menisci, the fourth component is made in the form of a positive lens and consists of a negative meniscus 5 52 mm focal length. relative aperture 1: 1.9, angle of field of view 45 °. 3 il.

Description

The invention relates to optical instrumentation, in particular to photographic lenses, and can be used as a standard lens in Zenit-type cameras.

The aim of the invention is to improve the quality of the invention and the luminosity.

FIG. 1 shows the principal optical layout of the lens; in fig. 2 is a graph of the modulation transfer function for the field center; in fig. 3 - the same for the angle of inclination of the beam of rays about 20 °.

The lens contains four components (six lenses in total).

The first component is the positive meniscus 1, which is concavity facing the image; the second component is a negative meniscus, facing by concavity towards the aperture diaphragm and consisting of glued positive 2 and negative 3 meniscuses facing concavity towards the aperture diaphragm; the third component is a negative meniscus 4 facing inward towards the aperture diaphragm, the fourth component is a positive lens,

consisting of two glued together - a negative meniscus 5 facing the concavity to the image, and a double convex lens 6. The aperture diaphragm 7 is located between the second and third components.

The lens works as follows; The light flux directed to the entrance pupil passes sequentially through the lenses 1, 2, 3, 4, 5, 6 and builds an image in the image plane.

The lens has the following characteristics:

focal distance

relative hole

angular field of view

transfer coefficient

modulation at a frequency of 30 mm

in the center of the floor KPM 0,4928

on the edge of the floor KPM 0.3175

 mm

The study of the optical scheme of the proposed photographic lens allowed us to establish the following:

a) at L5-P6 0.01, a spherical aberration of higher height of 52 mm appears unremovable.

1: 1.9

45 °

-one

WITH

WITH

oh oh

00

oh oh

pg, pkv, c with values and x P5-D) b J.CI4 complicates the correction of chromatism-GKVIX position aberrations and magnification

b) at 0.13, the observation of the spherical aberration and the lens coma was observed;

a) at% 45 spherochromatic aberration is unacceptable for ages.

Claims (1)

Invention Formula Photographic content. - “- four; the component is the aperture diaphragm between the second one of the components 1, the first component being the positive meniscus facing the visor / - the guest to the aperture diaphragm, and atori - the negative meniscus devoid of the mr of the burning flame and the negative meniscus facing the concavity to the apertureS, diaphragm, and - a negative pulse, facing by concavity to the aperture diaphragm, the fourth - a positane dioklenny, about tl and h: about u and with what, 0 In order to improve the image quality and luminosity, the fourth component is made in the form of a two-convex lens, glued from a well-defined meniscus and a two-convex lens, while the characteristics of the lens materials are satisfied by -0.04 P5-P6 0.0 i PZ-P2 0.13   4D where P2 is the refractive index of the positive meniscus of the second component; pz is the refractive index of the negative meniscus of the second component; pz is the refractive index of the negative meniscus of the fourth component; PB is the refractive index of the double convex gmnza of the fourth component,   coefficient of dispersion of the negative meniscus of the third component one V.-J b, 01 thirty FIG. 2 SO mm -one About cntcc 6, -№ 59 56