Optical method and apparatus for measuring objects

An image capture apparatus comprising:

• a housing having a window;
• a first mirror located in the housing, the first mirror having a concave parabolic reflective surface, and the first mirror having a focal point at which parallel rays of light that enter the housing through the window and reflect off of the concave parabolic reflective surface intersect;
• a second mirror located in the housing, the second mirror having a flat reflective surface, the second mirror positioned and oriented in the housing to reflect toward the focal point the parallel rays of light reflected by the first mirror;
• and
• at least one image sensor located in the housing at the focal point,
• wherein the second mirror is spaced from the first mirror by a first distance measured along a direction parallel to the parallel rays of light, the at least one image sensor is spaced from the second mirror by a second distance measured along the direction parallel to the parallel rays of light, and at least one of the first mirror, the second mirror, and the at least one image sensor is movable relative to the others of the first mirror, the second mirror, and the at least one image sensor such that at least one of the first distance and the second distance is adjustable, and
• wherein the at least one image sensor is positioned within the housing such that the at least one image sensor has a direct line of sight through the window of the housing.