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Hi Phil, my scope is a 10" Skywatcher at about F 4.8. I use a 3x barlow to give about F 14.4, I don't use any eyepieces. I use a Canon 60D DSLR in the 640x480 crop mode. I don't use sharpcap or firecapture, just straight onto the camera then transfer the videos to my computer. For jupiter I set the crop function in PIPP to 300, saturn and mars 250. The rest is just how it comes out after going through autostakkert and registax. Once finished I sometimes do further cropping in Paint if needed.
On the camera screen, jupiter looks about as big as a 5c coin, taking up about half the height of the screen. If it drifts a bit I use the arrow keys to keep it on screen. When filming, I like to be able to see on the camera the thin gap between the red spot and the cloud band, detail in the festoons, and the small round circles but needs to be good seeing conditions. Processing brings out more details than I can see at the camera.
From what I've read, you should film at about F20 to F 30, but I'm getting best results at F 14.4 with the 3x barlow. However, I'm not sure if that takes into account the crop mode magnification on the camera. I've tried with a 2x barlow and with two 2x barlows stacked (4x) but 3x has been best. I'd like to try a 3.5x barlow but I don't know if they make them.
Anyway, that's pretty much how I'm doing it at the moment and that may change if I find a better way. Here's a pic from a few nights ago that I didn't crop in PIPP, so that I could fit the moons in. I later cropped it a bit in Paint around the moons. Moons are Io and Ganymede:
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