18mm APS-C vs 28mm Full frame
28mm Full frame frames 4% tighter than 18mm APS-C.
A 18mm APS-C
B 28mm Full frame
The numbers
| A 18mm on APS-C | B 28mm on Full frame | |
|---|---|---|
| Focal length | 18mm | 28mm |
| Full-frame equivalent | 27mm | 28mm |
| Horizontal | 66.3° | 65.5° |
| Vertical | 46.9° | 46.4° |
| Diagonal | 76.2° | 75.4° |
| Sensor | APS-C 23.5 × 15.6 mm | Full frame 36 × 24 mm |
| Crop factor | ×1.5 | ×1 |
| Aspect ratio | 3:2 | 3:2 |
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