peevee1: They should have higher resolution in Green, not in blue. Only about 5% of cones in our eyes are responsive to blue light. We are adopted to see detail in green foliage, not in a blue sky.
The arrangement has to do with the absorption of colors of the spectrum according to their wavelength as they pass through the silicon wafer. Blue color penetrates the least so it´s on top of the sensor stack, the red color penetrates the most so it´s on the bottom of the stack. Please, see http://en.wikipedia.org/wiki/File:Absorption-X3.png
Josnio: A full frame camera with only 1/180 sec flash sync speed ?I´m a Canon user who wants to upgrade.. but this sync speed is even worse than Nikon D600´s to balance ambient light with flash.. What´s Canon thinking about..?
When you mix (or balance) ambient light with external flash, the shutter speed affects the "ambient portion" of the exposure. Flash exposure is not affected by shutter speed but is affected by aperture (as long as shutter is equal to or slower than sync speed).
A faster sync speed will give you a smaller power required from the flash to balance with the ambient.For example 1/250 at f16 = 1/125 at f22, that is to say, you can balance the same ambient light with half the flash power at a sync speed of 1/250 compared to a sync speed of 1/125. This is the general idea why it´s convenient a faster sync speed when using speedlights.
For further information, please see the Strobist blog from flash master David Hobby.
A full frame camera with only 1/180 sec flash sync speed ?I´m a Canon user who wants to upgrade.. but this sync speed is even worse than Nikon D600´s to balance ambient light with flash.. What´s Canon thinking about..?