New Lens Canon EF 14mm f/2.8. The Canon EF 14mm f/2.8 is Canon's widest rectilinear EF lens (The Canon 15mm f/2.8 Fisheye Lens is wider but not rectilinear) and is currently the widest Canon L Series Lens. The Canon EF-S 10-22mm USM Lens is a wider rectilinear lens, but it requires an EF-S lens mount.
1- Patent Publication No. 2013-47780
- 2013.3.7 Release Date
- Filing date 2011.7.26
2- Example
- F = 14.3mm focal length
- Half angle ω = 56.6 °
- Fno. 2.89
- 14 images in 10 groups lens configuration
3- Canon patent
- Antireflection film which is excellent in productivity and reflectance characteristics
- The refractive index of the substrate (original surface of the lens) is 1.65 to 2.20
- Consists of three layers, the ratio of the refractive index change with a three-layer
- The third layer
> Average roughness of less than 400nm pitch structure
> By continuously varying the ratio of the space-filling structure uneven, changing the refractive index
> After drying, the film is immersed in hot water and applied to the second layer solution (containing aluminum oxide) by spin coating, plate-like crystals deposited on the surface
- If spin coating of the wet process, excellent in productivity can be realized a uniform thickness
- Little change in the characteristics even if there is variation in thickness
New Lens Canon EF 14mm f/2.8 | Lens
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