Is anyone actually working with interlaced 1080 material? We get a lot of 1080 stuff but it's almost always 23.976 progressive. We just let the "interlacing" happen on the output. But I never see the fields on our stuff, I think it's just a flag in the file so it doesn't get rejected by the stations. I haven't seen any true interlaced source footage unless it came from Digi-Beta or SP.
I deal with 1080 interlaced footage all the time, but that's because I work on a "live" TV Show and that's the format we tape in - tho we regularly show lower rez material (720, SD,. youtube).
As per the original question, I'd lean towards keeping things at 1080 and delivering 720 when asked. It really does come down to what the clients want, but if you start off at the highest resolution you'll have your bases covered.
-gary
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