I guess I don't actually understand the phrase "__% crop" (for instance, "100% crop")
I was watching a YouTube video: "Nikkor 200-500mm f 5.6 - Is It Sharp?" (sorry, having trouble pasting the URL). The reviewer showed several bird photos at "1920x1080 1:1 crop" (screenshot example attached).
1. What does 1:1 crop mean? Does that mean a 100% zoom of the original, i.e. the cropped image (bird in this case) is 2x the size of the bird in the original out of camera?
2. What is special about 1920x1080? Is this some kind of standard? (I recognize 1080 as a number describing television monitors)