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Focal Length Calculator
Calculate focal length, magnification, and field of view for photography
About Focal Length
Focal length determines the angle of view and magnification of your lens. It affects how much of the scene is captured and how large subjects appear. This calculator helps you understand the relationship between focal length, sensor size, and subject distance.
Focal Length Photography Tips
- Wide Angle (10-35mm): Great for landscapes, architecture, and group photos
- Standard (35-70mm): Natural perspective, good for portraits and street photography
- Telephoto (70-200mm): Ideal for portraits, sports, and wildlife photography
- Super Telephoto (200mm+): Perfect for distant subjects and wildlife
- Crop Factor: Smaller sensors increase effective focal length and reduce field of view
- Depth of Field: Longer focal lengths create shallower depth of field
Common Sensor Sizes and Crop Factors
| Sensor Type | Dimensions (mm) | Crop Factor | Common Uses |
|---|---|---|---|
| Full Frame | 36 × 24 | 1.0x | Professional photography, low light |
| APS-C Canon | 22.3 × 14.9 | 1.6x | Enthusiast photography, sports |
| APS-C Nikon/Sony | 23.5 × 15.6 | 1.5x | Enthusiast photography, wildlife |
| Micro Four Thirds | 17.3 × 13 | 2.0x | Travel, video, compact systems |
| 1-inch | 13.2 × 8.8 | 2.7x | Compact cameras, action cameras |