Patent ID: 7855841

Claim:
A reflex, magnifying optical system that is a variable-magnification optical system having a plurality of lens groups and varying magnification by moving any of the lens groups, the reflex, magnifying optical system comprising: an optical element that is a prism refracting an optical path, an aspect of the prism on an object-side including straight edges symmetrical with respect to an optical axis; a first lens that includes planes parallel with the optical axis and symmetrical with respect to the optical axis, and includes a concave aspect facing the object-side of the optical element, a perimeter of the planes abutting the straight edges of the aspect of the optical element, and a second lens that includes a concave aspect facing an image side of the optical element with a radius of the second lens being smaller than a radius of the image side of the optical element and abuts the image side of the optical element.