Robert, et al You mentioned that the exposure was 40 minutes and also that those N-S tracks would require a specific altitude. Do you know the local time of the exposure? I am wondering how high a satellite would have to have been at the time of the exposure in order to be in sunlight, and if this is consistent with the altitude required for that orbit. I still think it was a plane. I don't know the details of the camera system used but there are some systems now with flip mirrors which flip the view from the camera to an eyepiece with an illuminated reticle, (usually with CCD systems). If such a system was in use it may be possible that the mirror was flipped during the exposure briefly reflecting the reticle onto the film, (very slim chance), not sure that is even possible.