Canon filed a patent for 50mm F2.8, 90mm F2.8 and 35mm F2.8 lens


Canon applied for a patent in Japan for 50mm F2.8, 90mm F2.8 and 35mm F2.8 lens. Via Egami

The patent document and its summarized:
◦ Patent Publication No. 2011-107313
◦ Published 2011.6.2
◦ Filled 2009.11.16
Embodiment 1
◦ Focal distance f=50.20mm
◦ Fno=2.90
◦ Half angle of view 23.32 deg.
◦ Image height 21.64mm
◦ Lens length 84.64mm
◦ Back focus 40.01mm
◦ Macro -0.950x
Embodiment 2
◦ Focal distance f=90.40mm
◦ Fno=2.90
◦ Half angle of view 17.90 deg.
◦ Image height 29.20mm
◦ Lens length 117.18mm
◦ Back focus 65.43mm
◦ Macro -0.480x
Embodiment 3
◦ Focal distance f=35.20mm
◦ Fno=2.90
◦ Half angle of view 31.58 deg.
◦ Image height 21.64mm
◦ Lens length 102.44mm
◦ Back focus 40.10mm
◦ Macro -0.480x

Sigma Normal 50mm f/2.8 EX DG for Canon EOS
Tamron Telephoto SP AF 90mm f/2.8 Di for Canon EOS
Tokina 35mm f/2.8 AT-X M35 Pro DX for Canon EOS

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