Angle of View
Focal Length
Sensor Format
Custom Sensor Size
Angle of View
Horizontal AoV
39.6°
Vertical AoV
27°
Diagonal AoV
46.8°
35mm Equivalent
50mm
Visualization
Field of View at Distance
| Distance | Horizontal Coverage |
|---|---|
| 1m | 0.72m |
| 3m | 2.16m |
| 5m | 3.6m |
| 10m | 7.2m |
| 25m | 18m |
| 50m | 36m |
Lens A
Lens B
Quick compare:
Comparison
| Property | 50mm (Full) | 85mm (Full) | Difference |
|---|---|---|---|
| Horizontal AoV | 39.6° | 23.9° | 15.7° |
| Vertical AoV | 27° | 16.1° | 10.9° |
| Diagonal AoV | 46.8° | 28.6° | 18.2° |
| 35mm Equivalent | 50mm | 85mm | -35mm |
| Coverage @ 5m | 3.6m | 2.12m | 1.48m |
Framing Scenario
Sensor Format
Shooting Distance
Lens Recommendation
Required Focal Length
120mm
at 3m distance
Ideal Focal Length
105mm
(85-135mm range)
Ideal Distance
1.4m
for 105mm lens
Frame Size
0.48m × 0.6m
Recommendation Notes
Use 85-135mm to avoid unflattering distortion
Lens Options for This Scenario
Minimum
85mm
Distance: 1.1m
Ideal
105mm
Distance: 1.4m
Maximum
135mm
Distance: 1.8m
Focal Length Categories
- Ultra-wide: <24mm (100°+ diagonal) - Architecture, interiors
- Wide: 24-35mm (63-84° diagonal) - Landscapes, groups
- Normal: 40-60mm (40-57° diagonal) - Street, documentary
- Short telephoto: 70-135mm (18-34° diagonal) - Portraits
- Telephoto: 135-300mm (8-18° diagonal) - Sports, wildlife
- Super telephoto: >300mm (<8° diagonal) - Birds, distant subjects
Crop Factor vs Perspective Distortion
Important: Crop factor affects angle of view, not perspective distortion.
- Same shooting position: A 50mm on APS-C and 75mm on Full Frame will have the same angle of view, BUT the perspective/distortion will be different because the 75mm was physically the same distance
- Perspective distortion is determined by camera-to-subject distance, not focal length
- Wide lenses appear to distort because you typically shoot closer to fill the frame
- For flattering portraits: Move back and use longer focal length, regardless of sensor size
- Equivalent result: To match the look of 85mm on Full Frame, use 56mm on APS-C and shoot from the same distance