Free › Field of View Calculator
Free live tool
Field of View Calculator.
Compare two lenses or cameras. See how wide each one sees, and how big a subject looks.
Runs in your browser. Nothing is sent anywhere.
Calculator
What will fit in the frame?
Set up two lenses and a distance. The picture shows what each one would capture.
Setup A
Across
Up and down
Corner to corner
Setup B
Across
Up and down
Corner to corner
Take it with youAlphaCaptureSwitch lenses and see the framing live on your iPhone.View app ›
How to read it
Why the same lens sees differently.
Focal length
Bigger number, narrower view.
A 24 mm lens sees a wide scene. An 85 mm lens sees a small part of it, enlarged. The angle gets smaller as the number grows.
Sensor size
A smaller sensor crops the view.
The same 50 mm lens sees less on a small sensor. The crop factor tells you how much, so 50 mm on an APS-C camera acts like about 75 mm.
Distance
Move your feet too.
Standing back with a long lens gives the same size subject as a wide lens up close, but the background looks very different.
Comparing phone lenses with real lenses.Phones quote a 35 mm equivalent number such as 24 mm. Choose that option above to compare them fairly with other cameras.
Forgetting the crop.Cropping a photo later has the same effect as a longer lens, but with fewer pixels. Choose the lens for the shot you want to make.
Trusting the angle alone.Angles are measured with the lens focused on infinity. Close focusing can narrow the view, especially on macro and some zoom lenses.
More free tools.
Lessons and tools. No sign-up.