Canon Patent: 6-30mm (eq. 28-140) Zoom for Compact Cameras
Egami (translated) spotted a Canon patent for a zoom optic to be featured on PowerShot G and/or S-series compact cameras. Description and performance chart after the break.
Egami (translated) spotted a Canon patent for a zoom optic to be featured on PowerShot G and/or S-series compact cameras. Description and performance chart after the break.
Japanese site Egami (translated) spotted new patents filed by Canon. All are for f/2.8 pancake lenses: 45mm, 40mm, 35mm, 28mm. Canon has two pancake lenses in their line-up: the EF 40mm f/2.8 STM and the EF-M 22mm f/2 STM
Focal length | Fno. | Half angle | Configuration length | Total length | BF | |
---|---|---|---|---|---|---|
One | 45.00 | 2.80 | 25.68 | 20.00 | 57.99 | 37.99 |
Two | 39.00 | 2.80 | 29.02 | 23.50 | 62.50 | 39.00 |
Three | 35.00 | 2.80 | 31.72 | 25.00 | 63.01 | 38.01 |
Four | 28.00 | 2.80 | 37.69 | 27.00 | 65.00 | 38.00 |
Image height = 21.64mm
Perfomance:
Egami (translated) spotted the next patents filed by Canon:100-400mm f/4.5-5.6 and 70-300mm f/4.5-5.6 Lenses.
Egami (translated) spotted new patents for lenses filed by Canon: 85mm f/1.2, 85mm f/1.8, 135mm f/2 and 50mm f/1.4.
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 |
Image height Y = 21.64mm
Egami (translated) spotted a patent filed by Canon that most probably refers to the next iteration of the Canon EF 70-200mm f/4L USM, released in 2006. Canon has another 70-200 in their lineup, the image stabilized EF 70-200mm f/4L IS.
Figure above: When electricity is applied the optical element gets a shape.
Another Canon patent spotted by Egami (translated).
Liquid lenses have a series of advantages over traditional lenses. Beside not having moving parts (and thus less mechanical parts), they respond quicker to electrical signals, they do not have a motor (you thought that USM was the big thing? Think again) and they are naturally much more silent. The lack of a motor also means such a lens needs less electrical power, hence the battery lasts longer. Liquid lenses are most likely going to be employed in compact cameras and/or smartphones. If you want a more scientific description about what liquid lenses are and do, I recommend this article.
It is not the first time Canon files a patent for a liquid lens (and yes, I shamelessly recycled some of the text of my previous post :-) ).
Patent description (machine translated):
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