Test 6. This is a 22" mirror from Galaxy Optics which produced a poor image, useable at low power only. 558.0 0.0 Mirror, obstruction diameters (mm) caustic 4950.0 Source distance (0=moving source) y, mm X, mm Y, mm 26.8 0.000 0.355 52.8 0.000 0.710 80.3 0.000 1.066 107.1 0.000 1.421 132.8 0.000 1.776 156.2 0.000 2.131 178.0 0.000 2.487 198.6 0.000 2.842 218.2 0.000 3.197 236.5 0.000 3.552 253.5 0.000 3.907 268.5 0.000 4.262 * -1.000 4970.731 Conic targets: b, R (mm) 1.0000 Measurement std deviation, mm 4934.0 Longitudinal reading bias, mm