What formats are accepted?
This depends on what the buyer needs, if they are a theatrical distributor, they will ask for film prints. If they are a DVD distributor, they will eithr ask for a Digibeta of HDCAM clones, now-a-days most TV stations in larger territories will ask for HDCAM SR tapes.
The most asked for in terms of aspect ratio is 16X9 1:78 Anamorphic.