I was trying to do a colour stack to combine with the luminance data. Unfortunately, by cropping the colour data I managed to go deeper than I could with the Lum, so I just left it out. Sometimes you win, sometimes you lose.

-28x5m Canon 6D/SVR90T with SCA flattener
-32x5m Canon R6mkii/Canon100-400mkii with 1.4x extender
-34x5m Canon Ra/Askar FRA600 with 0.8x reducer (RGB)
-61x3m Canon Ra/Askar FRA600 with 0.8x reducer (NB1)
All of the DSLRs were shot at iso 1600 and calibrated with bias/dark/flat frames.