[roughy (Mark)]

Hi all
The attached image was taken through LRGB filters about a year ago over several nights. Scope was centered manually each night because I didn't know how to plate solve until last week (pretty typical).

All images were registered, calibrated and stacked in DSS separately for each filter, opened in photoshop and pasted into the relevant channels in a new rgb layer.

Can anyone advise how, in photoshop, I can align each channel?
Cheers
Mark