|
Hi again
Rick I focused manually using A bahtinov mask with the Ha filter.
I realise that the astrodon narrow band filters are not par focal as they claim to be. The Ha stars were really tight. But the SII and OIII stars were not focused. The OIII was the worst..so will have to refocus between filters.
Greg by manually aligning them I mean after stacking the Ha,OIII and SII subs separately, when placing the RGB data in PS6 the stars did not line up. I had to manually move each channel and rotate each channel until the overlay looked right. It still wasn't 100% and it's really difficult to do. If you zoom in on the stars at the periphery you can see that the channels don't exactly line up.
What I don't know how to do is how to align the master stacked Ha,OIII,and SII so that when I paste them into PS6 RGB channels they line up perfectly without me having to do anything. I know I am still not 100% with my polar alignment and get a little field rotation.
I should also mention that I didn't take any dark, bias or flat frames here.
Thanks again
John.
|