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. The T-50 is offered on four standard materials; Chrome onGlass (CG) Chrome on Opal (OP) Photo Paper (RM) and Film (TM).
An ideal target for detecting Optical Astigmatism, Focus Errors and other aberrations. Can easily be incorporated into complete target arrays.