[ThinkPlease]

VLBI is so cool. I had the opportunity to reduce VLBI data with this sort of thing when I was a wee grad student (and I even published!). I recently came upon the opportunity to possibly do more work along these lines, and I'm contemplating the offer. It's a very exciting field, with great opportunities.

[RadioAstronomer]

VLBI is so cool.

Indeed it is! :)

[longshadow]

It's a very exciting field, with great opportunities.

Is there any theoretical or practical limitation that prohibits doing VLBI with OPTICAL instruments?

I should think the resolution would be, dare I say it: absolutely "ASTRONOMICAL!"