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raymo, when out of focus, the planetary discs can look really dim on your computer screen! So make sure you turn the gain to maximum, and set the exposure to, say 1 second - this really brightens up the image. Then get it centred and focused without the barlow. Then put in your barlow as the last step.
I have found that binning also really helps. My planetary imager is a CMOS 'webcam', not a CCD - though designed specifically for planetary work (Neximage 5).
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