What is sharp, where it stops, and how many frames a stack needs.

Depth of field is one formula that nobody wants to do at the tripod. This does it, and the two things the phone apps leave out: the diffraction limit for your sensor, and the focus-stack count for macro.

WHAT IT DOES

• Near limit, far limit, total depth, in front and behind, for any sensor, lens, aperture and distance
• Hyperfocal distance, and the near limit when you focus there
• Diffraction: the aperture where the Airy disk outgrows the circle of confusion, and the smaller one where it shows at the pixel level for your pixel pitch
• Full-frame equivalent focal length and aperture for crop sensors
• Aperture table f/1.4 to f/22 at your distance
• Focus stacking: near and far point of the subject, aperture and overlap in; frames needed, rail step and the focus distance of every frame out
• Portrait framing solver: pick headshot, head and shoulders, half, three-quarter or full length; it gives the distance to stand at for your lens and sensor, and the sharp zone there
• Background blur: the defocus disc a background light makes, as a percent of frame height and in pixels, for every aperture, with a plain verdict from sharp to creamy, and advice on subject-to-background distance
• Portrait warnings when the depth is thinner than a face

Sensors built in

Full frame, APS-C (Canon and Nikon/Sony/Fuji), Micro Four Thirds, medium format 44×33, 1-inch, smartphone.

Who it's for

Landscape shooters using hyperfocal, portrait shooters deciding between f/1.4 and f/2, and macro shooters who need to know if the stack is 8 frames or 80 before the light moves.

What you get

• The calculator (one .html file, runs in any browser, offline; works on a phone in the field)
• A 2-page quick-start guide

Good to know

• One file. No install, no account, no subscription, no internet needed after download.
• Your data stays on your computer. Export a backup any time; import it on another machine.
• Works on Mac, Windows, Linux and iPad (open the file in Safari or Chrome).
• Instant download.

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