[John K]

Hi guys,

I am looking to become more efficient in the way that I do my LRGB mono deep sky imaging with my rig which is a 12.5" f/5 telescope and a Cooled Zwo 174mm camera. I live just 5.5 kms North of the Melbourne CBD in severely polluted skies, and was hoping to be able to gather a substitute of my Luminance data in Ha and then by RGB data from a dark sky.

So questions are:

1. Can I fully substitute Luminance data with Ha data?

2. Will a 7nm Ha filter cut it in severely light polluted skies? The 3nm Astrodon (1.25") is astronomical in price!

My rig is low cost, and I want to keep it that way, but at the same time I don't want to be buying stuff I cannot use.

Look forward to advice/experiences.

Clear skies,

John K.