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That's great, IVO. Let me try it out.

Joe // BABO

Thanks, IVO, for the answer. Makes perfect sense.

However, excuse my ignorance.

How do I use the "first stack" as a "guide" for stacking the second set of light frames ???

I use DSS for stacking.

Is there a YouTube that describes that ???

Joe // BABO

I have been using ST 1.4 for many years -- always with *.fits files from a DSLR, stacked using DSS. I have now have two identical DSLRs -- except that one is modded for Ha and one is not. I was wondering if I could use two separate *.fts files (let's say for the Helix Nebula) -- one file for each ca...

Many thanks for explaining all that. Let me try it and see how it works with ST 1.4 Then I'll consider upgrading to 1.5 one of these days. BABO Hi BABO, Firstly, in all versions of StarTools, you can separate channels easily by just loading any "full color" stack into into the channel you need in th...

I have StarTools 1.4 and I have been using it for about four years. I tried an experiment with my Fuji X-A1 DSLR, mainly to deal with light pollution. I took a series of 120s light frames with an Ha. Then I took a series of 120s light frames with an O3 filter. I processed both sets together as two "...