From the article: Tech Specs: Canon EOS 1D Mark II 1/400sec f/2.8 ISO 1250 @16mmEtienne said:sposh said:I realise f2.8 means faster shutter speeds, was just wondering where you need it in real-world situations with such a wide angle. Astrophotography makes sense but ... sports? What sport gets shot at 16mm, chess? ;-) Just curious, does one normally go wider than 24mm for events/weddings of photojournalism? Maybe travel photography? (artisan in small dark workshop)
Lots of dramatic sports shots are taken with Wide and UW lenses. The first three olympic shots at telegraph here are ultrawide http://www.telegraph.co.uk/sport/olympics/picturegalleries/9461272/London-2012-Olympics-Photographers-tricks.html?frame=2302709
More on that http://magicvalley.com/blogs/between-the-frames/wide-angle-sports-shooting/article_d875ca72-43ed-11e2-8493-0019bb2963f4.html
Google will get you tons of examples wide shots. And a huge proportion of winning journalism shots are captured at wide - ultrawide.
This means 16*1.3 = 20.8 ~ 21mm. OK very wide and out of 24-70 range but not that Ultra wide. In addition a 1DMkII at 1250 ISO must be equivalent or worse than a 1DX or a 5DMkIII at ISO 2500. So the f/4 lens would do. I acknowledge however that in cases like that a f/2.8 lens with worse corners is more useful than an f/4 with excellent corners.
Until Canon makes the ultimate UWA zoom, its horses for courses I guess...
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