新專利: EF-S 17-55 f/3.5-5.6 IS STM

Canon剛剛提出新鏡專利EF-S 17-55 f/3.5-5.6 IS STM
據說也許會在今年內取代現行的18-55 IS STM成為新款的KIT鏡



來源:CR

內文:

Another lens patent has shown up today. This time an EF-S 17-55 f/3.5-5.6 IS STM. Perhaps it’ll be a new kit lens this year and will replace the current 18-55 IS STM. However, this may also be a hold over from last years kit lens update.

Description and self-interpretation of the patent literature
◾Patent Publication No. 2014-21258 ◾Publication date 2014.2.3
◾Filing date 2012.7.18

◾Example 2 ◾Zoom ratio 2.92
◾Focal length f = 18.50-32.89-54.00mm
◾Fno. 3.49-4.39-5.80
◾Half angle ω = 36.44-22.55-14.20 °
◾Image height Y = 13.66mm
◾119.77-110.06-120.23mm overall length of the lens
◾BF 37.98-52.51-74.3mm

◾Example 3 ◾Zoom ratio 3.09
◾Focal length f = 17.50-32.05-54.00mm
◾Fno. 3.47-4.38-5.80
◾Half angle ω = 37.97-23.08-14.20 °
◾Image height Y = 13.66mm
◾119.55-108.81-118.68mm overall length of the lens
◾BF 36.59-51.53-73.93mm

◾Canon patents ◾4-group zoom of positive and negative positive negative
◾Inner folder – Kas (Group 3)
◾The fourth lens unit can also be used for anti-vibration


Source: [EG]