Autocollimator eyepiece-view generator

Each reflection of the primary's triangle center spot is placed using the alignment-error geometry(primary-axis error A, focuser-axis error B). Reflection offsets from the pupil:P = 2A, R1 = −2A−2B (upright), R2 = 6A+4B (inverted), R3 = 2A+2B (inverted).The figures are therefore physically consistent, not drawn by hand.