Paul_K Offline Upload & Sell: Off
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IMO it's due to how the camera manufacturer determines the ISO values
Of course they should always be the same no matter what brand, just like aperture values should
always express the same values on every lens.
But from what I've seen, and by comparing the technical details, from colleague,Canon using, catwalk shooters, Canon seems a bit optimistic in that regards
Also, due to the sensor used, Canon camera's can't take the kind of under exposure modern Nikon DSLR's can, resulting in e.g. chromatic noise, muddy colors etc.
Not just a personal opinion, but well documented in the several tests on the difference in shadow details recovery you can find on numerous serious review sites like DP review, Imaging Resource etc.
I have been shooting catwalk since the early 80's on film, e.g. on ISO Tri X pushed to ISO 800 http://www.pbase.com/paul_k/kabk_1987 or ISO 64 Kodak Y pushed to ISO 125 http://www.pbase.com/paul_k/puck__hans_1984 with only manual focus lenses as slow as the Nikkor 4.5/80-200 AiS and 4.5/300mm ED (wow, how did we do that back then)
Only started shooting catwalk seriously on digital with the D3 (the D2X really was horrible around/over ISO 800, the D1H somewhat better but limited for cropping purposes due to the small sensor)
Within the circle of professional catwalk I worked among, of course had plenty of many Canon shooting colleagues, and in the early digital days Canons undeniably better then Nikons.
That gap however was overcome with the D3
In particular with the 'midrange' professional bodies like D3 vs 1DIII, D3S vs 1DIV, D800 vs 5D2 ( remember Canon introduced the 1DX in Oct 2011, but released it as late as June 2012, with the 5DII, although released like the D3 in 2008m due to the outdated original 5D AF system not really up to shooting fast action like sports and catwalk), Nikons seemed, based on what I saw comparing my shots with those of Canon shooting collegues, to perform much better, especially when shooting under available light e.g. the D3 http://www.pbase.com/paul_k/20110617_kabk_den_haag or D800 http://www.pbase.com/paul_k/20150626_kabk
Although the newer 1DX/1DX2 and 5D3/4 have much improved in that regards, I personally (but I'm a Nikon shooter of course) don't think they have outperformed Nikon the D5 and D750
Don't like/prefer not to be shooting with flash, although if forced to do so, Nikon speedlight/flash metering has proven to work near flawless http://www.pbase.com/paul_k/20121124_mafb_adam (two off camera SB800's with PW TT5 triggers on separate lightstands , only possible because I was one of the three professional shooters present )
Don't believe in using studio units to shoot models at the end of the catwalk
Not only no professional catwalk shooter does that (image the several dozens of photographers in the shooting pit each setting up a studio flash when shooting the fashion weeks ), but shooting models only when they pose at the end of the catwalk fails to capture the mood/atmosphere in which the designer wants to present his clothes.
Otherwise why bother the expense of setting up a catwalk show, hring the venue, the lights, music, and the effort of training the models, and presenting te collection under the often not ideal stage light, ruffled due to the movements of the models, and with the improvised poses that come with a catwalk show, when shooting a model in a studio posed against a white background, styled into perfection, with every hand and finger in the right spot (as is the case in a studio shoot) will do a much better job of presenting the clothes
Also from a practical photography point of view, setting up studio lights (apart from the above mentioned problem if all shooters would do so) is way too bothersome to do so quickly before a show, while the size of a studio flash head will risk blocking the view of the video camera's, while it's much less reliable with regards to the, if any, TTL metering compared to dedicated speedlights
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