Peter, that is a great animation!
Consider it nicked and bookmarked for future reference to send to others.
I would like to try those 85 deg Explore Scientifics one day, I hear good things about them. I too agree with what you about the 100 deg- I'm not quite there yet- 85deg is more than I can handle at the moment, with the 70deg being my preferred fov. I find that the fov is large enough that I don't have to work my eyeballs too much as it's just the right size to take it all in.
EDIT: Whoa! And I've just noticed they are back on sale- back down to $99 from $179!
Grrrrrrr i've just used up my allowance of astro purchases at Xmas. Hope that sale will stay for a while. I'd be interested in trying the 4.7mm.