The annual M42 this year is a mosaic with the Running Man. APP dealt with the gradients really well after messing with the Normalisation and Integration parameters.
M42, NGC 1977
250mm f4. Newtonian MPCC
QHY168c @-15°C IDAS P2
10x180s each pane, 2/10 Darks, flats, dark-flats
APP, Photoshop, Topaz DeNoise AI
Mosaics in APP – defaults unless otherwise stated 1. Load – all as normal – you don’t need to use separate sessions for each frame if you did it all at the same time 2. Calibrate as normal 3. Analyse stars – I needed to increase from 500 or it wouldn’t work – went 1400 – might have been the subject but I suspect it helps to stitch the mosaic together 4. Register – Registration mode – mosaic, use dynamic distortion model, uncheck same camera and optics (will be suggested if you don’t) Scale stop = 1 (for a 10% mosaic overlap) 5. Normalize – Mode – advanced – neutralize background LNC degree – 2nd degree, iterations 3 6. Integrate – Enable MBB – 10% because I did 10% overlap in the mosaic INTEGRATE – and if you’re lucky it all works