Re: Should I use progressive on EX1 for greenscreen, even when shooting 4:2:2?

Yes.

You are always going to have better results with progressive. The only advantage of interlace is with fast action footage, such as sports.

You shouldn't feel afraid of progressive. You won't notice any difference when editing. When you have separate frames it allows for cleaner shots.

Brent Dunn
Owner / Director / Editor
DunnRight Films
DunnRight Video.com
Video Marketing Toolbox.net

Sony EX-1,
Canon 5D Mark II
Canon 7D
Mac Pro Tower, Quad Core,
with Final Cut Studio

HP i7 Quad laptop
Adobe CS-5 Production Suite