Patent ID: 8581986
Filing Date: 2013-11-12
Classification: G03B,H04N

Abstract:
1. A test target for measuring a focus performance of a camera and lens combination, comprising: a target body, the target body displaying a pattern comprising: a ruler positioned adjacent to the edge of the target body, such that the secondary pattern directly abuts a zero line of the ruler, wherein each of the primary pattern and the secondary pattern comprises a high contrast two-toned pattern, and wherein each of the primary pattern and the secondary pattern comprises: a square divided into four quadrants, wherein two of the four quadrants are black and two of the four quadrants are white, the two of the four quadrants that are black being positioned diagonally from each other and the two of the four quadrants that are white being positioned diagonally from each other; and a first perimeter surrounding the square, wherein a portion of the first perimeter that contacts that two of the four quadrants that are black is white, and a portion of the first perimeter that contacts that two of the four quadrants that are white is black.