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The optical formula for a new EF 50mm f/1.4 has appeared. It looks like the lens has internal focus and an odd negative front element. We haven’t heard anything for a while about a new 50mm f/1.4, but it’s definitely needed.
Patent Publication No. 2015-138121
- Published 2015.7.30
- Filing date 2014.1.22
Example 1
- Focal length 49.10
- F number 1.45
- Half angle (in degrees) 23.78
- Image height 21.64
- Overall length of the lens 100.16
- BF 38.10
Canon patents
- Positive ShiboTadashi
- Inner focus (part of the first group)
- Source: Egami
