Yeah, from what I read (since I don't have any c-mount lenses myself) the typical scenario is shoot in 1080 and crop in post to 720 for final delivery as 720p24 or shoot 1080, crop out vignetting and upsample to 1080. IMHO, the benefit of cropping in camera, especially for the first scenario, would be more efficient workflow and potentially higher image quality, because bitrate bandwidth does not have to be spent on encoding stuff that will be cropped out anyway.In fact it possibly can be done in software, look at crop settings in TS file.