Wow, lots of resolution and looking good too. These mosaics can be huge projects. I have done something similar, but not to the same resolution, using a zeiss 135mm f2.0 of a full frame 6D. Working on it now actually - data from the Gum Nebula (Vela) through the galactic core to Cygnus. Simply taking months!
I think the key is to keep everything consistent from panel to panel - exposure, focus, ambient conditions (as much as possible), etc. It's like you slot into a routine for each panel.
Has the oly been modded? Geez - that 150 f2.0 looks good! It's a good part of the sky to have a crack at it. Keep up the good work!
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