Hi Jen.
// Motion blur + wider / bigger shutter angle .. + maybe slow the speed of motion a little? //
Sounds interesting. If you’ve seen it done, it must be possible.
Just to check I’m clear on what you’re seeing: the ghost effect is only visible when the animation is played, and it’s on both your computer screen and your video out (and these aren’t LCD screens, not able to refresh quickly? Of course they’re not!? But if you stop the After Effects playhead and examine a still frame, the ghost isn’t there? So if you export a still frame from a moving part of the animation, it isn’t showing the problem?
If so, then maybe you are on the right lines with motion blur. What happens in you combine motion blur with a much bigger shutter angle?
Also, just in trying to test the limits, what happens if,as a test, you slow down the animation speed across teh screen – how slow do you have to go for the effect to disappear …?
Just checking – are you working with with field rendering enabled?
Of course there’s a limit to how fast things can travel across the screen before the movement looks harsh – and it’s faster with interlaced footage than progressive-scan frames – but this doesn’t sound like it’s your problem here …
I’d be interested in any solution you find.