Is this artifact reduced by going from a Canon 6D(my current camera body) to a more higher density pixel sensor like the Canon 5Ds and by how much?
Hi,
If we're talking about Aliasing artifacts, and the same focal length is used, then yes the artifacts are less likely to occur.
The sensel pitch of the 6D is approx. 6.58 µm, and the sensel pitch of the 5Ds is approx. 4.14 µm. So the detail that is too small to be reliably resolved by the 6D, might be resolvable by the finer pitch of the 5Ds, which would avoid aliasing.
For aliasing to occur, the aperture must be wide enough to avoid diffraction blur, the focus must be perfect, and spatial frequency of the image detail must be equal or smaller than the so-called Nyquist frequency of the sensor. Camera or subject motion can also create enough blur during the exposure time to prevent too small detail from reaching the sensor.
So it's hard to predict
how much less the risk is, but
it is less likely to occur on the 5Ds under the otherwise same circumstances.
Cheers,
Bart