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Thanks for the comments.
Jo, Liveview 5x mode is selectable in Backyard EOS in the planetary tab. It's 1024x680 centre-cropped (not quite 1:1 pixel mapped, but extremely close). For display, I scaled up x2 - easier to see in a browser (well, with my older eyes, anyway).
Frame rates are a bit variable in Liveview. In 5x mode, with my laptop, they vary from around 15-25fps. At this image scale, Mars moves clearly in about 10 minutes, so I keep videos to around half that, which means around 6000 frames at a typical frame rate - that's what I set in BYE. (You can see why I want a camera with faster frame rates - and probably a faster laptop - I want to get >20,000 frames within 5 minutes).
Choosing how many frames to stack depends on quality. If there is a hard and fast rule, I don't know it. I've been using <10% for Mars, sometimes as low as 4%. I'm still experimenting.
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