# Camera Lens Equivalent

> Calculate 35mm equivalent focal length for different sensor sizes.

Page: https://askcalculators.com/calculator/camera-lens-calculator/
Definition: https://askcalculators.com/calculator/camera-lens-calculator/definition.json
JSON Schema: https://askcalculators.com/calculator/camera-lens-calculator/schema.json
Version: 7.0.0
Maintained by: AskCalculators (software project; not a credentialed reviewer)
Qualified review: pending. Automated checks do not establish professional approval.
Page status: Live
Review status: Pending

## Use
Open the calculator page and enter values. Query-string parameters can restore and bookmark a calculation.
Example: https://askcalculators.com/calculator/camera-lens-calculator/?cropFactor=1.0&focalLength=50

## Inputs
- cropFactor: Crop Factor; type=select; optional; default=1.0
- focalLength: Focal Length (mm); type=number; optional; default=50

## Outputs
- result: Result; format=text; primary

## Formula
Field of view = 2·atan(sensor dimension ÷ (2·focal length)); crop-equivalent focal length = focal length × crop factor.

## Rules
- Empty optional inputs are undefined, not zero.
- Hidden conditional inputs are ignored.
- Do not invent missing required inputs.