Camera Field di View
Comprendere Lens Angles
Impara Informazioni FOVField di view (FOV) e il angle di il scene your camera captures. Comprendere FOV helps choose il right lens per landscapes, portraits, o action—e explains perche il same focal length produces different results on different cameras.
Lens Categories da Field di View
| Category | Focal Length (FF) | Diagonal FOV | Typical Usa |
|---|---|---|---|
| Fisheye | 8-16mm | 180-100° | Creative, action cams |
| Ultra-wide | 14-24mm | 114-84° | Architecture, landscapes |
| Wide-angle | 24-35mm | 84-63° | Street, environmental |
| Standard | 40-60mm | 57-40° | General purpose |
| Short telephoto | 70-105mm | 34-23° | Portraits |
| Medium telephoto | 135-200mm | 18-12° | Sports, events |
| Super telephoto | 300-800mm | 8-3° | Wildlife, astronomy |
Focal lengths shown sono per full-frame (35mm) sensors.
Sensor Size e Crop Fattore
Il same focal length produces different FOV on different sensor sizes.
Comuni Sensor Sizes
| Format | Dimensions | Crop Fattore |
|---|---|---|
| Medium Format | 44×33mm (typical) | 0.79× |
| Full Frame (35mm) | 36×24mm | 1.0× |
| APS-C (Canon) | 22.3×14.9mm | 1.6× |
| APS-C (Nikon/Sony) | 23.5×15.6mm | 1.5× |
| Micro Four Thirds | 17.3×13mm | 2.0× |
| 1-pollice | 13.2×8.8mm | 2.7× |
| Smartphone (typical) | ~6×4.5mm | ~6× |
Equivalent Focal Length
Equivalent FL = Actual FL × Crop Fattore
A 50mm lens on APS-C (1.5×) gives il same FOV as un 75mm on full-frame.
FOV Measurements
Field di view puo be measured in three ways:
Diagonal FOV
- Corner un corner di il frame
- Largest angle misurazione
- Most commonly cited specification
Horizontal FOV
- Side un side di il frame
- Important per panoramas e video
- Informazioni 80% di diagonal per 3:2 format
Vertical FOV
- Top un bottom di il frame
- Smallest di il three
- Informazioni 54% di diagonal per 3:2 format
Esempio: 50mm on Full Frame
- Diagonal: 46.8°
- Horizontal: 39.6°
- Vertical: 27.0°
Video e Cinema FOV
Video applications often specify horizontal FOV.
Comuni Video FOVs
- Ultra-wide (GoPro): 120-170° diagonal
- Wide: 90-100° diagonal
- Linear (corrected): 80-90° diagonal
- Medium: 65-75° diagonal
- Narrow: 50-60° diagonal
Aspect Ratio Impact
- Wider aspect ratios (21:9) hanno larger horizontal FOV
- Same diagonal FOV covers different horizontal area
- Anamorphic lenses create wide FOV con different characteristics
VR e Gaming FOV
Virtual reality headsets prioritize immersion through wide FOV.
VR Headset FOVs
- Early VR: 90-100°
- Current mainstream: 100-120°
- High-end: 120-140°
- Human peripheral: ~180° (il goal)
Gaming FOV Settings
- Lower FOV (60-75°): Less distortion, feels "zoomed in"
- Standard FOV (90°): Comuni default
- Higher FOV (100-120°): More peripheral awareness, some distortion
- Personal preference e monitor distance affect ideal setting
Security Cameras
Security camera specifications emphasize coverage area.
Typical Security Camera FOVs
- Wide-angle: 90-120° (room coverage)
- Standard: 60-90° (hallways, entries)
- Narrow: 30-60° (specific areas)
- PTZ range: Variable, often 60° un 2°
Coverage Calculation
At distance D, horizontal coverage width:
Width = 2 × D × tan(HFOV/2)
Esempio: 90° HFOV at 10m covers 20m width
Calculating FOV
Da Focal Length e Sensor Size
Diagonal FOV = 2 × arctan(diagonal / (2 × focal length))
Esempio: 35mm Full Frame
- Sensor diagonal: √(36² + 24²) = 43.27mm
- Focal length: 35mm
- FOV = 2 × arctan(43.27 / 70) = 2 × arctan(0.618) = 63.4°
Finding Focal Length per Desired FOV
Focal length = sensor size / (2 × tan(FOV/2))
Conclusione
Field di view e il angular extent captured da un camera, determined da both focal length e sensor size. Wide FOV lenses (short focal length) capture expansive scenes but con potential distortion; narrow FOV lenses (long focal length) isolate subjects con background compression. Comprendere crop factors e essential quando comparing lenses across different camera systems. FOV specifications sono important across photography, videography, VR, gaming, e security applications.