Difference between revisions of "Optics"
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(Created page with "== Focal Length and Angle of View == * Formula: $\alpha = 2 \cdot \arctan \frac{d}{2f}$ * $\alpha$: Angle of view in radian * $f$: Focal length * $d$: Diameter. Regular 35mm f...") |
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* $f$: Focal length | * $f$: Focal length | ||
* $d$: Diameter. Regular 35mm film is 36mm wide and 24mm high, hence use $d=36$ for horizontal angle, $d=24$ for vertical. | * $d$: Diameter. Regular 35mm film is 36mm wide and 24mm high, hence use $d=36$ for horizontal angle, $d=24$ for vertical. | ||
| − | * Popular focal lengths | + | * Popular focal lengths and ''horizontal'' angle of view |
*# 24mm: 74° | *# 24mm: 74° | ||
*# 28mm: 65° | *# 28mm: 65° | ||
Latest revision as of 23:47, 14 August 2014
Focal Length and Angle of View
- Formula: $\alpha = 2 \cdot \arctan \frac{d}{2f}$
- $\alpha$: Angle of view in radian
- $f$: Focal length
- $d$: Diameter. Regular 35mm film is 36mm wide and 24mm high, hence use $d=36$ for horizontal angle, $d=24$ for vertical.
- Popular focal lengths and horizontal angle of view
- 24mm: 74°
- 28mm: 65°
- 30mm: 62°
- 35mm: 54°
- 40mm: 48°
- 50mm: 40°
- 85mm: 23.9°
- 90mm: 22.6°
- 150mm: 13.7°
- 300mm: 6.87°
- 600mm: 3.44°