Abstract. Calculation of probable backlashes in plantings details of objective lens and influence of conditions of unit assembly and adjustment on lens centering and image quality are considered. Characteristics of the fields of scattering and errors tolerances of backlashes of conjugated details are analyzed for the probable values of the resulting backlashes. Being casual errors, backlashes are noted to posess a significant regular component caused by regular errors in conjugated components dimensions. Assembly of a lens with horizontal chassis position is shown to allow for reduction of backlashes influence on the accuracy of lens components centering as compared to the "vertical" arrangement when the lens centering breaks because of errors of the diameters of the lens components. To achieve the required quality of generated image, it is necessary to consider the effect of violation of centering of the lens components on aberration at the center and at the edge of the image field.

Keywords: backlashes, lens, image quality, centering, adjusting

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