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Hi Troy,
Very few objects emit more in the SII or OIII regions than they do in Ha. A few planetary nebulae do, but in those cases you could shoot OIII as luminance. The reason people usually don't do as you suggest is that it takes a lot of time to shoot the OIII and SII, and if it's not going to add much to the image then why bother.
There are some people that have shot Ha, SII, OIII, R, G and B and then combined them as a six colour palette, maybe Fred has done this.
Cheers
Stuart
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