Wedge shaped segments with 45 equal bar and space widths (8 degrees per cycle or 4 degrees per spoke) over a 360 degree circumference circle. Overall image size 50mm diameter.
An ideal target for detecting Optical Astigmatism, Focus Errors and other aberrations. Can easily be incorporated into complete target arrays.
Chrome on OPAL
0.29 to 100 cy/mm
4.0 in. x 4.0 in. – 101.6mm x 101.6mm
45 equal bar and space widths (8° per cycle or 4° per spoke)