Patent: Soft Focus Lens Designs, Various Focal Lengths

Last updated: May 6, 2025 1:28 am

Published: June 21, 2018

1 Min Read

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Canon has filed a patent spotted by Canon News for a variety of soft focus lenses. The most interesting of the bunch is a 70-200 f/4 full frame lens with a backfocus of 25mm, meaning it's not an EF mount lens.

35mm f/1.8 full frame EF Canon mount

Focal Length 33.75
F-Number 1.72
Image Height 21.64
Total Lens Length 132.93
BF 39.14

58mm f/1.4 full frame EF Canon mount

Focal Length 57.57
F-Number 1.43
Image Height 21.64
Total Lens Length 160.04
BF 40.43

105mm f/2.0 full frame EF Canon mount

Focal 103.2
F-Number 2.17
Image Height 21.64
Total Lens Length 123.79
BF 42.2

70-200 f/4 full frame BF of 25mm (not EF mount)

Focal 72.21 – 194.06
F-Number 4.00
Image Height: 21.64
BF 25.98

TAGGED:patent soft focus

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ByCraig Blair

Craig is the founder and editorial director for Canon Rumors. He has been writing about all things Canon for more than 17 years. When he's not writing, you can find him shooting professional basketball and travelling the world looking for the next wildlife adventure. The Canon EOS R1 is his camera of choice.