I thought I'd try my luck at an ISS shot . I accidentally bumped it to f/6.3 instead of the minimum f/5.6 . I was surprised that ISO 200 and 1/100th got me plenty of light. The ISS is pretty bright and as it passed from SW to NE, it passed straight overhead while I shot from my driveway in Manhattan Beach, CA. I shot both on tripod and then handheld when it was straight up. I think this shot (7:59:44pm) was handheld just after passing straight overhead. Gotta love that 500mmII +1.4xIII in front of the 5D4 . I must have cropped away at least 99% of the shot and then up-res'd it in Lightroom.