Here are some new pancake lens patents from Canon. A total of 4 pancake lenses to be announced. They are Canon EF 45mm f/2.8, Canon EF 40mm f/2.8, Canon EF 35mm f/2.8, Canon EF 28mm f/2.8.
Detail: (Translated by Google)
- Patent Publication No. 2013-137411
- Publication date 2013.7.11
- Filing date 2011.12.28
- Example
embodiment 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
- Canon patent
- The longer the focus back a Gaussian type, field curvature occurs
- 2-group configuration positive positive, Gauss type
via: egami
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BF of 38-39mm is too short for EF lenses. More likely these are EF-S, or EF-M designs.
… but half-angle specs are for ‘full frame’. Who knows? Apparently not me 😉