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Originally Posted by Aussie_Dave
Cheers Marc, that helps a lot. I figured I'd need to do 2 videos, one for the moon edge and a separate video for Saturn as the moon has passed over it and merge the 2 images, layering the moon over Saturn. That may be the safest way for me being my first attempt as I don't want to stuff it up just with the one video. I also don't know exactly where Saturn will pop out from the edge, I'm just going by what Stellarium shows me. I'll be at a focal length of 2500mm and using either the ASI224mc or Neximage 5.
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If you have stellarium you can very accurately plan where Saturn will transit the limb and look for the features on the moon surface. That's what I did and it was spot on. Don't forget to set the moon scale to 1 in Stellarium. Also selecting Saturn and pressing the space bar will center it on your screen with a reticule so you know where it is behind the moon. I used that with the current time to know when to go back out and start videoing again.
Don't bother doing two videos. It is likely you'll have plenty of moon shots from various videos during the event to get a sharp moon composite. You'll also have many videos of saturn on its own to get a sharp planet. You can crop around saturn to register only the planet when it's far enough from the moon.
In short just keep shooting short videos of 1000 or 500 frames and keep recording, tweaking the levels. Then you'll have plenty of data to get the bits you need to make your final composites.
Not sure about Neximage. I haven't used it in years. Sharpcap is pretty cheap to buy and it does a great job. Better play it safe. Rehearse well ahead. Maybe train on star occultations with the moon.