佳能又注册镜头新专利——28-70mm F2.8以及28-60mm F4.0，不出意外两支镜头都是狗头定位，具体规格如下

案例 1
焦距: 28.84-67.90
光圈（F-Stop）: 2.91
半视角: 32.65-17.67
像高: 21.64
长度: 149.46-115.94
后焦距: 13.48-27.78

案例 3
焦距: 28.84-60.00
光圈（F-Stop）: 4.12
半视角: 32.68-19.83
像高: 18.50-21.64
长度: 141.33-104.61
后焦距: 19.70-35.51

Idiom – Chase rainbows

Meaning – To pursue unrealistic goals or dreams. To try to get something you can never have. If you are 'chasing rainbows' you are wasting your time trying to do something you are unlikely to be able to achieve.

例句：
A:“Stop being daft. You’re never going to replace the boss. She does a great job and she’s been here forever. Stop chasing rainbows!”

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