I guess that YOU CAN...that is possible. I have seen a film that was 4:3 HD within a PILLARBOXED (that is the term) frame. So, it is possible.
HOWEVER...no one will air HD in that manner. The place where I did see that...they did blow up 4:3 DV50 to HD and pillarboxed it. But then they couldn't air it because...well...no one airs HD in that manner. Just isn't done. So we had to then capture that footage using a Kona 3, and resize it to chop off the top and bottom. Quality loss...yes. But that was the only way that it would air. You can also dub it and use a Terranex to blow it up and resize.
So yes, it can be done...but WHY? It just isn't an accepted format in my experience.
Shane
