An objective of an oblique viewing, rigid endoscope, including a prism arrangement consisting of distal and proximal prisms contacting with planar contact surfaces that are oblique to an axis of the objective, the distal prism includes a distal front face toward the viewing direction of the objective, from which the rays entering there enter through the distal prism and through a passage area of the contact surfaces into the proximal prism and after double reflection in the proximal prism on a first mirror on a diagonal surface and a second mirror on the contact surface exit in the direction of the axis of the objective through a surface perpendicular to the direction of the axis of the objective, wherein the second mirror is arranged outside the penetration area, and an absorption layer is arranged in the plane of the second mirror between this and the penetration area.