Lens Comparison
Enter two focal lengths and the same sensor dimensions. The table estimates horizontal and vertical field of view, records the minimum focus distances you provide, and states the perspective consequence of keeping the camera position fixed.
Comparison
| Lens A | Lens B | |
|---|---|---|
| Horizontal field of view | ||
| Vertical field of view | ||
| Minimum focus distance | ||
| Perspective at same camera position | Unchanged; perspective follows camera position. | |
Estimates only; minimum focus distance is displayed as supplied.
A QUICK WALKTHROUGH
How to use this tool
- Enter the two focal lengths and the sensor width and height.
- Optionally enter each lens minimum focus distance from its manual or product documentation.
- Compare the bounded field-of-view estimates and the fixed-position perspective note.
Transparent model
Horizontal and vertical field of view use 2 × atan(sensor dimension ÷ (2 × focal length)). Results are estimates for rectilinear lenses and do not use a manufacturer specification database.
Perspective boundary
If the camera stays in the same position, changing focal length changes framing while perspective relationships stay the same. Moving the camera to match framing changes perspective.
Minimum focus distance
Minimum focus distance is optional user supplied data. This tool does not infer, verify, or rank lens specifications.
GOOD TO KNOW
Common questions
Does this identify which lens is better?
No. It compares the supplied focal lengths and values; optical quality, distortion, transmission, autofocus, and compatibility are outside the comparison.
Why is perspective marked as unchanged?
Perspective depends on camera position relative to the subject. A different focal length alone changes the frame, not the viewpoint.