=== Centre of rotation on SHOC ===
Since 19 Jan 2017: (527,538) - SHOC removed to check mounting (all ok) & countersink ND filter wheel screw below camera mount plate18 Jan 2017: (530,527) - secondary retaining ring & radial screws tightened7 Nov 2016, the rotation axis of DER1 is at pixel coordinates : (524, 527) on SHOC. There is some non-repeatability in the SHOC mounting, so each time it is removed, this value should be verified with autorotate while exposing.primary & secondary mirror retaining screws & secondary retaining ring tightened
=== Start-up recipe ===
