I have a Cassini PM-160 spherical mirror used in telescopes as the primary mirror. The mirror is concave with a radius of curvature of 2600mm and focal length of 1300mm. I have a very basic question. If an on object is located beyond the focal length of a concave mirror then the virtual image should appear inverted. When I look at the mirror any reflection beyond the focal length appear upright, albeit a little blurry. For example an object that is located at 2meters away from the mirror appears upright, not inverted. Why is that? If the radius of curvature or focal length not advertised correctly?