Kodak claims the equivilent of 20 megapixels per 35mm frame for Kodachrome film. Works out to something like 4000x5000 pixels. Poser only renders at 3090 max pixels. DPI does not matter until you are printing out on paper. Hirez film scanners are advertised that do up to 8000. (I know that does not add up if the film will only do 4K x 5K but those are the numbers that are out there)