Some Reflections and Further Comments on Aperture (Two Photographs)
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Shot with a Fuji XT-2, and a 23mm lens (aspect ratio equivalent to a 35mm lens) at F8. You will notice that pretty much everything is in focus. In landscapes and photographs of events, crowds, and large objects it is not always feasible to use a small F Stop like F 16 and get sharp pictures and everything in focus. A depth of field calculator could provide, for any given F Stop a definitive distance to focus on ( say ten feet out) called the hyper-focal distance that would make sure everything is in focus. Or if fiddling with your smartphone is too much, use this rule of thumb, focus one-third into the scene this should get most everything in focus, not as much as the calculated hyper-focal distance but good enough. When we use larger apertures (smaller F Stop ) we get the exact opposite effect; selective focus (where your focus is on something close and everything behind is more or less out of focus). A large aperture also allows more light to reach the sensor therefore avoiding having to use a higher ISO and generate noise.