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<p>Canon Explorer of Light Danny Green has put the EF 100-400 f/4.5-5.6L IS II through the paces for the CPN. While there’s no way the article would say anything negative about the lens, all the positives about it are worth noting.</p>
<p><em>“This EF100-400mm f/4.5-5.6L IS II USM lens has the new, special Air Sphere Coating (ASC) technology that incorporate what Canon calls a low refractive index layer. It took me a while to get my head around this, but it’s fascinating. Basically, when light enters a lens, it slows down as it passes from the air through the glass. This slowing down in speed is what causes reflections and flare, causing problems such as ghosting and contrast degradation.”</em></p>
<p><em>“It works with an EF1.4x converter<sup>*</sup> too, unlike the old 100-400 which would only let you manual focus with it fitted. With this new lens you can use AF no problem with the central focusing point. Another big step forward.”</em></p>
<p><strong><a href="http://cpn.canon-europe.com/content/education/technical/danny_green_on_ef100_400mm_f45_56l_is_ii_usm_zoom.do" target="_blank">Read the full article at CPN</a> | <strong><strong>EF 100-400 f/4.5-5.6L IS II: <a href="http://www.bhphotovideo.com/c/product/1092632-REG/canon_9524b002_ef_100_400mm_f_4_5_5_6l_is.html/bi/2466/kbid/3296" target="_blank">B&H Photo</a> | <a href="http://www.adorama.com/CA1004002U.html?KBID=64393" target="_blank">Adorama</a> | <a href="http://www.amazon.com/gp/product/B00PF39PEY/ref=as_li_tl?ie=UTF8&camp=1789&creative=390957&creativeASIN=B00PF39PEY&linkCode=as2&tag=canorumo-20&linkId=DR7JYMNZQZ4LVBHE" target="_blank">Amazon</a></strong></strong></strong></p>
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