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Robin - I'd be using the SX image as luminance if its in the RC... the resolution (arcsec per pixel) would far surpass that of the QHY8 in either the 127 or the RC, as it has smaller pixels. Unless you shot Ha all night with the QHY8 in the RC, and RGB images with the starlight through the 127ED..
Clearly the best way to do it would be with identical cameras in each scope, and just scale the colour data to fit the close up Lum.. Ie - Mono KAF8300 for lum, and OSC 8300M for data...
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