Depth of field
Pick your camera (or a sensor size), focal length, aperture and how far away your subject is. You see where sharpness starts and ends, the hyperfocal distance and how soft a background at a given distance will be.
How it works
The sharp zone is worked out with the classic thin-lens formulas and a circle of confusion of the sensor diagonal divided by 1500 (0.029 mm on full frame), the usual standard for a print viewed at a normal distance.
Focus at the hyperfocal distance and everything from half that distance to infinity looks sharp: the landscape photographer's favourite trick.
Background blur is the size of the blur disc of a point far behind the subject, as a share of the picture width. Above about 1% the background looks clearly soft.
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More tools
See what a focal length takes in on your sensor, drawn on a scene, with the angle of view.
Crop factor & equivalenceFull-frame equivalent focal length and aperture for every sensor size, both ways.
Diffraction limitFrom which f-number stopping down starts to soften your camera's pixels.
Handheld shutter speedThe slowest speed for sharp handheld photos with your focal length, sensor and stabilisation.