New Coating
Below seems to be a patent for large protruding front elements, that will help with issues of reflection and cleaning. This could possibly appear in the much talked about EF 14-24 f/2.8L.
Patent Publication No. 2012-159723
- 2012.8.23 Release Date
- 2011.2.1 filing date
Example 1
- F = 14.3mm focal length
- Fno. = 2.89
- Half angle ω = 56.6 °
- 14 images in 10 groups lens configuration
- Existing coating roughness
- Will making cleaning the front element easier and possibly less destructive
Canon patent
- (Coating applied to one surface of a lens) thin film layer
- Having a plurality of tubular spaces are arranged parallel to the tube
- Maximum opening diameter of the tubular space below 400nm
- The inorganic oxide materials (silica, titania)
Source: [EG]
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