Patent: CN-E 20-100 T2.8 & CN-E 20-120 T2.8-T3.5

Here we have another patent for more cine lens optical formulas. This time for two lenses, a CN-E 20-100 T2.8 and a CN-E 20-120 T2.8-T3.5.

I’m starting to think we’re going to see some new cinema lenses this fall once the EOS C300 Mark II begins shipping.

Patent Publication No. 2015-18083 (Google Translated)

• Published 2015.1.29
• Filing date 2013.7.10

Example 1

• Zoom ratio 6.00
• Focal length 21.00 87.93 125.94
• F number 2.77 2.77 3.66
• Half angle of 35.54 9.68 6.79
• Image height 15.00
• Overall length of the lens 314.76
• BF 50.03
• Example 2

Zoom ratio 5.00

• Focal length 20.00 69.46 100.00
• F number 2.76 2.77 2.77
• Half angle of 36.50 12.03 8.42
• Image height 14.80
• Overall length of the lens 294.44
• BF 50.07

Canon patents

• Positive and negative positive and negative positive five-group zoom
• Inner focus (part of the first group)
• Inner zoom

Share on Facebook
Share on Twitter
Share on Google+
Source: Egami