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Canon EF Lens Technology Video

Canon Rumors

Who Dey
Canon Rumors Premium
Jul 20, 2010
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www.canonrumors.com
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<p><iframe width="500" height="281" src="https://www.youtube.com/embed/fkBOsTVfpdA?feature=oembed&start=13" frameborder="0" allowfullscreen></iframe></p>
<p>If you enjoy being a geek about glass, this video should be right up your alley.</p>
<p><strong><span style="color: #ff0000;">c</span>r</strong></p>
 
Was an interesting point that they are still having to use ground & polished aspherical elements on larger diameter lenses where moulded cannot be accurate enough - at least with current technology. There is no doubt that moulded elements are getting better as time goes one. Witness the Canon 35 f/2 IS, the 24 f/1.4 and many of the recent Sigma lenses. To the best of my knowledge, moderate size lenses that use G & P asphericals are: 24-70 f/2.8 II, 35L, 85L, 16-35 f2.8 II. Even the 50 f1.2 L uses moulded.
 
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