Adjustable diopter type finder optical system

摘要

An adjustable diopter type finder optical system comprising an eyepiece comprising a first lens component having negative refractive power and a second lens component having positive refractive power, the finder optical system being arranged to make diopter adjustment by moving both of the first and second lens components in the same direction along the optical axis by varying the distance between those lens components and arranged so that variation of magnification and fluctuation of aberrations are small.