I have experienced smearing with 400 ASA film (both color and B&W) in a red window camera when used in bright sunlight, even when slider is opened just long enough to wind film to the nxt exposure. I have used Ilford and Kodak B&W film, as well as Kodak E-6 and C-41 film. I can't recall exactly at the moment, but I seem to recall Ilford smearing more than Kodak... and all color film smearing more than I can accept.