<H1>Canon Patent EF 14mm and EF 17-35mm With Flourite</H1>

17-35mm f/2.8-4

14mm f/2.8

Egami, the Japanese photography blog discovered two new Canon patents involving a wide angle flourite concept. Such a patent could be part of a new ultra-wide zoom lens, perhaps a EF 14-24mm or a replacement to the EF 16-35mm f/2.8 IS II. Egami also thinks it’s possible this patent could be for the EF-M mount. It’s an interesting concept and speculation. You can see a video from Canon on using flourite in high performance leses. Read the full  patent in Japanese here.


Patent Publication No. 2013-37339

• 2013.2.21 Release Date
• Filing date 2011.7.12

Example 1

• Zoom ratio 1.00
• Focal length f = 1.00mm
• Fno. 2.90
• Half angle of view ω = 56.66 °
• Image height Y = 1.52mm
• 9.51mm length lens
• BF 2.82mm
• 6 aspherical surfaces, the first surface 25
• Punctually

Example 3

• Zoom ratio 2.06
• 2.06mm – f = 1.00 focal length
• Fno 2.79 -. 4.00
• Half angle of view ω = 51.27 – 32.82 °
• 1.33mm – Y = 1.25 image height
• 8.55mm – 8.79 length lens
• BF 2.41 – 3.46mm
• Aspheric first surface, the fifth surface, the first surface 26
• Positive and negative positive negative

Example 6

• Zoom ratio 1.00
• Focal length f = 1.00mm
• Fno. 2.90
• Half angle of view ω = 87.35 °
• Image height Y = 21.60mm
• 9.51mm length lens
• BF 2.82mm
• 6 aspherical surfaces, the first surface 25
• Punctually

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