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Message: <blockquote data-quote="J-see" data-source="post: 420627" data-attributes="member: 31330">If you're shooting close to an airport, direction and speed will be fairly similar for most and when calculating one, you can use that as a starting point for the other. But like Eyelight said, if you pan, it's different.When I say 100% crop, it's when you look at a shot that is displayed at the same size as the pixels it contains. If you'd crop something to let's say 1200*800 pixels and save it as that size, you require a perfect pixel freeze. But if you crop to 2400*1600 and save that as a 1200*800 you can get away with a blurred pixel. Then it may travel 2 pixels during that same shutter and you'd likely not notice in the finished shot.Remember: this is not exact science since we guess the time and distance so you have to find out what works best for you.</blockquote>