RosiArt wrote:
I have both the original Canon 7D and the 6D, but I'm considering selling them(trading) for a new 5D III. All my lenses are EF L's so that's not an issue. It will cost about $1000 differential. I don't care about the WiFi feature on the 6D. My thoughts are I eliminate 1 camera, get one that's more capable in every way except the 8 fps of the 7D.
Thoughts??
I have just faced your exact dilemma and traded a pristine 7D + cash for an equally nice 5D MkIII. It was a carefully thought out decision, and after owning the 5D MkIII for a month, I could not be more pleased. I did consider keeping the 7D and purchasing a 6D for FF, but the less rugged build, much slower fps and inferior autofocus (I shoot lots of candida/sports) convinced me to go with the 5D instead. I did consider a 7D MK II, which is a great action/ sports camera with pro construction like the 7D or 5D III, and I may add one when I have the $ (for reach), but the fps of the 5D is not that much slower, the autofocus is as good for my use, and the FF noise/high ISO capabilities are superior (as you know from owning a 6D). The big upside of the 5D is the same as the 6D (or any FF camera) lower noise at high ISO, higher usable ISO and better dynamic range, but with much superior autofocus and build quality compared to the 6D. There are also some nice added features of the 5D, including autofocus micro adjustment at both ends of a zoom's range, HDR, etc.
I compared the dynamic range charts and noise performance of the 7D, 6D, 7D MkII and 5D, MKIII, and the 5 was worth 2 - 2-1/2 stops of ISO performance over my 7D, and the quality of anything beyond ISO 1600 was very noticeable which you know as the 5 and 6D are almost identical in that respect. I had been shooting high school wrestling matches with the 7D with a 70-200 F2.8L IS and needed to shoot at ISO 3200 with a less than optimum shutter speed. The resulting noise was apparent and limited my cropping abilities. With the 5D, I'm able to shoot at ISO 12,800 and still crop without obvious noise allowing me to shoot at the higher shutter speed I needed compared to the 7D. The only downside of the change is the shorter reach of the FF using long lenses, but the attendant upside is that my wide angle zoom (17-40) now has a field of view that's really equivalent to 17mm instead of the equivalent of ~27mm with an APC. To get that FOV with the APC, I'd need to be at 10-11mm with the attendant distortion of an ultra wide. I do intend to add a Canon 1.4x Tele extender to regain some of the reach. I will lose some effective aperture (and perhaps IQ), but I believe that will be more than compensated by the higher usable ISO.
My opinion (which is certainly open to debate) is that modern FF cameras with their lower noise and higher usable ISO allow you to use slower lenses than an APC, which translates into lower cost and less weight for all your lenses for equivalent performance (with the exception of fast lenses specifically chosen for shallow DOF and creamy bokkeh for portraiture). Finally, if you ever intend to shoot professionally, FF will be a requirement for many applications. Just my personal decision for my type of photography - yours may be different.