Nail focus, framing & exposure every shot
Free calculators built for DSLR and mirrorless photographers — know your depth of field before you shoot, frame the exact scene your lens covers, and dial in exposure without guesswork. Every result shows its formula.
Depth of Field Calculator
Near, far & total in-focus range for any lens, aperture and distance.
Open calculatorField of View Calculator
Angle of view and the real-world frame your lens covers.
Open calculatorCrop Factor Calculator
Full-frame-equivalent focal length and aperture for any sensor.
Open calculatorHyperfocal Distance Calculator
The focus point that keeps everything from half that distance to infinity sharp.
Open calculatorExposure Value (EV) Calculator
Turn aperture, shutter and ISO into a single exposure number.
Open calculatorNight Sky 500 Rule Calculator
The longest shutter you can use before stars trail.
Open calculatorUnderstanding Depth of Field
How aperture, focal length and distance combine to control what's sharp in your frame.
The Exposure Triangle, Explained
How aperture, shutter speed and ISO interact — and how to balance them for any scene.
How to Shoot the Night Sky
Settings, planning, and the 500 rule for capturing stars and the Milky Way without trails.
All Guides
Browse the full photography guide library — techniques, settings, and gear math explained.