Compare calculators
Both calculators run independently β change the inputs on either side to compare results.
Photography
Flash Guide Number Calculator
Calculates the correct aperture (or maximum distance) for a manual flash given its guide number and the flash-to-subject distance. Indispensable for manual flash photography without TTL metering.
Fill in the required fields to see your result.
Photography
Hyperfocal Distance Calculator
Finds the closest focus distance at which a lens keeps everything from half that distance to infinity acceptably sharp. Essential for landscape and street photographers seeking maximum front-to-back sharpness.
Fill in the required fields to see your result.
Key differences
| Flash Guide Number Calculator | Hyperfocal Distance Calculator | |
|---|---|---|
| Category | Photography | Photography |
| Inputs required | 2 | 3 |
| Result | Required Aperture (f/) | Hyperfocal Distance (mm) |
| What it does | Calculates the correct aperture (or maximum distance) for a manual flash given its guide number and the flash-to-subject distance. Indispensable for manual flash photography without TTL metering. | Finds the closest focus distance at which a lens keeps everything from half that distance to infinity acceptably sharp. Essential for landscape and street photographers seeking maximum front-to-back sharpness. |