Moiré disaster on the E-5

Started Jul 10, 2013 | Discussions thread
Great Bustard Forum Pro • Posts: 40,753
Re: Ironically...

rovingtim wrote:

Great Bustard wrote:

rovingtim wrote:

Airmel wrote:

The technology simply doesn't exist to build a cheap optical low pass filter which has anywhere near the performance of its electronic signal processing counterpart. For this reason you might rightly refer to all optical anti-alias filters as "weak".

Perhaps optical AA's aren't as efficient as their electronic counterpart, but I think the key is more likely to be "The technology simply doesn't exist to build a cheap optical low pass filter ..."

I suspect this has more to do with why the industry has campaigned to wean photographers off AA's. Additionally, I think it could be argued that the 'carrot' they used is the appearance of higher resolution that results from the artifacts.

And here we are. pixel count increases, the quality of the AA filter can afford to decrease, so it makes it cheaper and easier to manufacture the AA filter.

Can you explain this further, please?

Aliasing for the higher MP sensor is going to occur at higher frequencies than it is for the lower MP sensor, thus, the effect of aliasing is going to be at a much smaller scale in proportion to the photo as a whole.  Thus, aliasing errors due to imperfections in the AA filter will detract less from the photo as a whole with a higher MP sensor.

In addition to this, there is the fact that diffraction, as well as other sorts of blur (lens aberrations, motion, etc.) will do more to aid the effectiveness of the AA filter for the higher MP sensor, thus the AA filter does not have to be as good to work as well.

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