Which lense to use?

DSLRs aren't the best camera for Green screen stuff... but they'll work with a really well lit screen.

If you want a tight of the head, use a portrait length lens like an 85mm, really anything 50-130.

For a medium shot, use a wider lens. Greenscreen is pretty simple shot compositions generally. Light it bright, stop down the aperture and increase your DOF. You want the entire foreground to be in focus. If the front fo the face is in focus, but the rear is soft, you won't have very much fun trying to get a clean key.

But yeah, since there's no background to worry about or weird shooting conditions, most any lens will do you.
 
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