mark from thailand

<p>I agree with Puppy Face. My 6D battery lasts less than a day with the GPS (or Wifi) on. I tend to switch it on during a shoot, for one or two shots and then turn it off again.</p>

<p>I have the 70-300 f/4-5.6 and the 70-200 f/4. I find the 70-200 a little sharper and it suffers far less from vignetting than the 70-300 on a FF camera. The 70-300 is also bulky.</p> <p>Both have their place but, if I do not need the reach, I always use the 70-200.</p>

<p>150,000</p> <p>"The shutter of the EOS 5D Mark III is more 50% more durable than the shutter seen in its predecessor, with 150,000 actuations, and also offers a significantly reduced shutter lag of down to 59ms"</p> <p>http://cpn.canon-europe.com/content/education/technical/inside_canon_eos_5d_mark_iii.do</p>

<p>This is a pretty well documented problem with on camera mounted units and wide angle lenses (< 24mm).</p> <p>For example, in the 270Ex manual "Do not use the 270EX II in the extended position with lenses that have a focal length of 30mm or less, otherwise the edges of the frame will be noticeably darker than the center. "</p>

<p>Seems to be some pretty poloarised views here.</p> <p>I, too, have both bodies, married with the same lenses as the OP, with the 6D as my back-up.</p> <p>Both are great. I have had no issues with dynamic range or muddied shadows in either. However, I do not have a Nikon or Sony to compare against.</p> <p>The AF and build quality is significantly better in the MK III. The Wifi, GPS and lighter body better in the 6D.</p> <p>I think, unless you have specialist, high end needs, you will be happy with either.</p>