Hi Chris
I'd bail on the STX mate huge can of worms
Get a ProLine before it's too late to go back better camera by all standards, just look at how many are out there being used veeeery successfully
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Having two scopes and two cameras is fantastic, you will be in a great position
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It's a no brainer, I'd put the 16803 on the AG10 and the 8300 on the FSQ, then use the FSQ to gather the RGB and the AG10 to get the deeeep Lum or Ha all at the same time
Mike