Canon filed some new wide-angle zoom lens patents in Japan. These are 16-35mm f/4, 17-40mm f/4, 17-40mm f/2.8-4, 16-35mm f/2.8.
- Patent Publication No. 2014-41245
- Publication date 2014.3.6
- Filing date 2012.8.22
- Example 1
- Focal length f = 16.49-23.55-33.95mm
- Fno. 4.10
- Half angle ω = 52.68-42.57-32.51 °
- 14 pieces of 10-group lens configuration
- Example 2
- Focal length f = 17.50-25.45-38.90mm
- Fno. 4.10
- Half angle ω = 51.03-40.36-29.08 °
- 15 pieces of 11-group lens configuration
- Example 4
- Focal length f = 17.50-24.82-38.89mm
- Fno. 2.88-3.25-4.10
- Half angle ω = 51.02-41.08-29.09 °
- 15 pieces of 11-group lens configuration
- Example 5
- Focal length f = 16.50-25.34-34.00mm
- Fno. 2.91
- Half angle ω = 52.66-40.49-32.47 °
- 15 pieces of 11-group lens configuration
- Canon patents
- 4-group zoom of positive and negative positive negative
- Inner focus
via: EG
Affiliate Disclosure: Some of the links in this article are affiliate links. As an Amazon Associate I earn from qualifying purchases. This means if you click on the link and purchase the item, we may receive a small commission at no extra cost to you. This helps support our site and allows us to continue making comprehensive reviews.
hummm, I think 16-35 f2.8 is already on the market, isn’t it?
That’s version 2. This would be version 3 with improvements.
I’ve had them all; 17-35, 16-35, 17-40, 16-35 Mark II. Hopefully they get it right this time!