Camera Sensor & Lens Equivalence Engine
Understand what your camera sensor actually changes.
Compare sensor sizes, calculate focal-length equivalence, and see how field of view changes across formats.
- Full Frame 36 × 24 mm
- APS-C (Sony, Nikon, Fujifilm) 23.6 × 15.7 mm
- Micro Four Thirds 17.3 × 13 mm
- 1-inch 13.2 × 8.8 mm
Drawn to scale and centred on the lens axis.
Three calculators, one dataset
Every tool reads the same verified sensor dimensions, so a crop factor on one page is the crop factor everywhere.
- Focal length equivalenceConvert any focal length to its full-frame equivalent. 35 mm on APS-C frames like 53.4 mm on full frame.Open tool →
- Sensor size comparisonPick two formats and see width, height, area and crop factor side by side, drawn to scale.Open tool →
- Field of viewHorizontal, vertical and diagonal angle of view for any focal length on any of the formats.Open tool →
Sensor formats
The 7 formats that cover almost every interchangeable-lens camera and premium compact, largest first.
| Format | Size | Area | Crop factor |
|---|---|---|---|
| Medium Format 44×33 | 43.8 × 32.9 mm | 1,441 mm² | 0.79× |
| Full Frame | 36 × 24 mm | 864 mm² | 1.00× |
| APS-H | 27.9 × 18.6 mm | 519 mm² | 1.29× |
| APS-C (Sony, Nikon, Fujifilm) | 23.6 × 15.7 mm | 371 mm² | 1.53× |
| APS-C (Canon) | 22.3 × 14.9 mm | 332 mm² | 1.61× |
| Micro Four Thirds | 17.3 × 13 mm | 225 mm² | 2.00× |
| 1-inch | 13.2 × 8.8 mm | 116 mm² | 2.73× |
What the sensor changes
A smaller sensor records a smaller part of the image the lens projects. The lens itself does not change: its focal length, its perspective and its aperture stay the same. What changes is the field of view, which is why the same lens looks longer on a crop sensor. The equivalent focal length is the full-frame focal length that would give the same view.
Seroix computes crop factor from the sensor diagonal against the full-frame diagonal instead of using rounded figures. The rounded numbers printed in marketing are close, but the computed value is what decides the framing.
Common comparisons
All comparisons →Crop factorfull-frame diagonal ÷ sensor diagonal
Equivalent focal lengthfocal length × crop factor
Field of view2 × atan(sensor dimension ÷ (2 × focal length))