Canon 9-18mm f/4 IS, 10-20mm f/2.8-4 IS, and 11-22mm f/2.8 IS optical systems patent application

[EOS 4 Life]

Example 1

• Focal length:10.33-19.39
• F-number: 4.08-4.12
• Half angle of view: 61.36-48.13
• Height: 18.92-21.64
• Overall length: 128.82-123.27
• Back Focus: 12.13

Example 2

• Focal length:9.20-17.90
• F-number: 4.08-4.12
• Half angle of view: 64.04-50.40
• Height: 18.90-21.64
• Overall length: 125.26-119.35
• Back Focus: 10.50

Example 3

• Focal length:11.30-23.90
• F-number: 4.08-4.12
• Half angle of view: 59.29-42.15
• Height: 19.02-21.64
• Overall length: 129.79-129.33
• Back Focus: 14.54-10.54

Example 4

• Focal length:11.30-22.00
• F-number: 2.89
• Half angle of view: 59.44-44.52
• Height: 19.14-21.64
• Overall length: 137.35-125.58
• Back Focus: 13.50-10.50

Example 6

• Focal length:10.30-19.80
• F-number: 2.89-4.12
• Half angle of view: 61.76-47.54
• Height: 19.18-21.64
• Overall length: 132.94-127.01
• Back Focus: 11.35

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