New fast primes
The often talked about 50 f/1.4 and 135 f/2 have appeared in a new patent this week. We've heard that a replacement to the 50 f/1.4 would come first. A new 135 f/2L is a desired lens if they put IS into the upgrade. We've also heard a new 85 f/1.2L with reduced weight and approved AF performance was also on the horizon.
- Patent Publication No. 2013-114133 (Google Translated)
- Publication date 2013.6.10
- Filing date 2011.11.30
| Focal length | Fno. | The overall length of the lens | BF | Lens constitution | |
|---|---|---|---|---|---|
| One | 85.00 | 1.24 | 122.56 | 38.35 | 10 pieces of six groups |
| Two | 83.30 | 1.80 | 116.11 | 39.11 | 10 sheets in 7 groups |
| Three | 132.30 | 2.06 | 162.67 | 43.23 | 10 sheets in 7 groups |
| Four | 51.70 | 1.41 | 87.84 | 38.94 | 7 group nine |
- Factors that chromatic aberration of magnification chromatic aberration or axial chromatic aberration occurs
- Reducing the total length
- Focal length for a long time
- Glass material Abbe number 70-90, of 1.4-1.5 refractive index
- Possible correction of axial chromatic aberration
- Must increase a curvature, spherical aberration and curvature of field is generated
- Canon patent
- I use a glass material having an anomalous partial dispersion of the predetermined
- Consisting of organic and inorganic compound
Source: [EG]
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