What is a "100% Crop"?

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Platographer Contributing Member • Posts: 569
What is a "100% Crop"?
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This may sound like a silly question and maybe it is. I always thought a 100% crop was a portion of any image displayed at a 1:1 pixel ratio, or what you would see if you had the full image file and zoomed in at 100% to the portion in question. However, I am wondering whether a 100% crop is actually achieved by a 200% zoom because that seems to be the case with the Camera Labs review of the Sony 16-35mm GM. I scrolled down to the far distance test images in the Quality section of the review and downloaded the full-res files from which the crops were taken. In order to replicate the "100% crops," I had to zoom into that portion at 200%. This was true for both my 4K and 1080 monitor. Why is that? Is 200% zoom a 1:1 pixel level or is my computer just off?

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