Hi Jim Simon,
I was told that 1920x810 is the standard RED Wide format. So I wanted my 5d video to look the same as the RED wide.
"When a commercial widescreen movie is mastered for distribution on Blu-Ray disc, it's rendered at the full 1920-pixel width of the FHD format. Due to its wide aspect ratio, however, the movie's height covers only about 810 pixels of the 1080-pixel height of the screen, with upper and lower borders letterboxed. This 1920x810 frame is the native size of widescreen Blu-Ray video."
And also I really don't think that the sequence size would matter to render the project.
I was told that 1920x810 is the standard RED Wide format.
I don't believe that's true. At least, I've never seen those dimensions listed in any RED camera specs.
More to the point, most deliverables are MPEG in one form or another, and MPEG works best when the dimensions are evenly divisible by 8. So do give that 1920 x 800 a go and see what happens.