Before we start, just a quick reminder of 6D Major specification – Newly announced Canon 6D features new 20.2-megapixel full-frame CMOS sensor and DIGIC 5+ Image Processor, 11-Point AF with Center Cross-Type Point, 63-Zone Dual Layer Metering Sensor, Extended ISO Range of 50-102400, Up to 4.5 Full Resolution FPS and Built-In HDR and Multiple Exposure Modes.
Building upon the qualities that made the EOS 5D Mark II camera so successful, the EOS 6D bridges the gap for budget-minded photographers, videographers and cinematographers who are eager to step up into the world of full-frame imaging. but how this camera stand in front of 5D Mark III, let’s see the specification comparison below
It’s no doubt that Canon 5D Mark III have a very advance AF system compared to 6D,
Canon 6D and 5D Mark III share same ISO range, The AF system of Canon 5D Mark III is advance compared to Canon 6D but the core specification of both the camera says
Canon 6D AF Working Range : Center AF Point: EV -3 to 18
Canon 5D Mark III AF Working Range: EV -2 to 18
AF working range also depend on type of lenses you use, but under test condition the Canon 6D (center) AF point will perform better under low-light environment compared to 5D Mark III.
Canon 5D Mark III have more shutter range of 1/8000, Fast continuous shooting speed with bit more megapixel, better LCD screen and a 100% viewfinder.
Canon 6D will cost you approx $ 1.3K less than Canon 5D Mark III, features Full Frame sensor and same ISO range as 5D Mark III with DIGI5+ image processor and built in WiFi with GPS.
The decision is your’s but being a nature photographer I will prefer 6D to save few bucks for new lenses.