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3 or 6nm Ha is far better than 12nm for imaging, esspecially in a city, narrow means more detail and less pollution. Yes, wider OIII and SII gives bigger stars leaving an ugly fringe, but if you use Ha as lum and the other as a colour blend (LRGB) detail in SII OIII is less important so you can reduce the star size to the same as Ha stars in PS (or just a few clicks in Startools and many other apps). Better still, since star colour doesnt mean much in NB, just delete them in SII and OIII and your left with nice clean small white HA stars and full colour everywhere else.
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