Ok, I did the OIII in a similar manner as described for the Ha and got this result, I believed this worked out just fine. However I did get this warnings during steps 2 – 6…
Hi Rob,
I am looking at the file list. You’re getting this warning, because you have loaded a master flat for the single lights. Which it will apply to. But it can’t and shouldn’t be applied to the old OIII stack from PI, since it has different image dimensions. So this warning is just a reminder to the user that he/she possible has a wrong flat loaded.
In such a case, I would recommend first calibrating your new lights with the calibration frames. And then saving the calibrated lights.
Next proceed with your newly calibrated lights and your old stack from PI. Then you should get no warning and integration should be fine.