Pempro's camera orientation and calibration setup for PEC is a beautiful thing isn't it! It's fool proof with, 'what shape is the L?'
Users of TheSkyX (and now retired CCDSoft) don't have it so easy (well, not as of the latest daily build anyway) and we often read about mis-orientated cameras. I've been there myself. The PE graphs produced on those nights appear pancake flat; as you'd expect when a camera is off by 90deg and thereby lowering the RA's peak to peak error
