Photos can pop when one area is in sharp focus and the other blurry, providing the impression of depth in a two-dimensional image that matches how our eyes focus on objects, even though we don’t typically perceive this. This technique once required a lens of the sort found on an SLR or DSLR (analog or digital single-lens reflex) or mirrorless camera. You adjust the f-stop, traditionally noted with an ƒ, which changes the depth of field or the range
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