[popo]

[quote name='Brightcolours' timestamp='1285229877' post='3143']

Diffraction has nothing to do with the layout of colour. Detail has nothing to do with colour, even.



Diffraction is caused by the lens, it appears in the projected image. That image gets sampled. Diffraction effects on an image are the same for ALL full frame sensors, no matter what resolution and no matter what structure their RGB matrix is. Even similar for a full frame BW sensor.

Diffraction effects on an image are the same too for all 1.5x crop sensors, no matter what resolution or type of sensor. The new Sigma is an 1.5x crop sensor.

The other SIgmas have a 1.7x crop sensor, which is smaller than an 1.5x crop sensor. So obviously, the older SIgmas will enlarge the effects of diffraction on the image more than the new one.

[/quote]

I am aware of the physics involved, but you've totally missed the point. I'm not the best at explaining stuff so let's try again. While diffraction "happens" at the lens, it still has to get detected by the sensor before we see it. Due to the softening effects of the bayer pattern and low pass filter, it should be noticeable at an output pixel level much "later" on a 15MP bayer sensor than a 15x3 foveon of same area for example.



I get a feeling we're all arguing for the same thing but expressed in totally different ways...