Some on line info of unkown accuracy shows the 6D has better long exposure high ISO performance. This is known as amp glow.
The intended usage would be for astro phorotgraphy or night photgraphy where 30 second exposures at ISO1600 and up are required.
I already have a 5D-mk3 comming for evaluation where I will compare it to my 1DS-mk3. But I thought this is a good question for this forum. It seems strange that the lower cost camera would have supperior performance.
Anyone have personal experince or a technical explanation? Or is the information incorrect?
The same info also shows a vast improvement over the 1DS-mk3 and 5D-mk2
Not sure about long exposures in particular, but most of the reputable reviews I have seen say that the 6D has a slight noise advantage over 5D3, but only at high ISO's. Part may be due to the sensor being just a bit newer, but I am sure part of it is simply good-old-fashioned lower pixel density due to having 10% fewer MP's.
Low light was more important to me than extreme action so I went 6D. Between the possible 5D3 AF lag in low light, and the 5D3 lack of red AF points, and then this slight 6D advangage in low noise at high ISO, I thought it made the best sense for me personally.
I know this topic is long dead, but somehow I was searching more comparisons at night shooting scenario between 6d vs 5dm3 and came across that topic (also in this forums here).
I think that below article comparing 6d to 5dm3 (and later also to 5dm2) at iso 3200 & 6400 with 15 sec & 30 sec exposure time, shows pretty good results in favor of 6D. the maker of that comparison also intended to use 6D camera for astrophotography.
hope it helps.
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