In praise of AA filters

Started 10 months ago | Discussions thread
Vlad S
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It's not a "yes" or "no" proposition
In reply to Reilly Diefenbach, 10 months ago

Reilly Diefenbach wrote:

All but one manufacturer, from Sony to Fuji to Leica to Pentax to Phase One (Canon has to be thinking about it) have quite correctly eliminated the blur filter, and good riddance to it. Sony's best ever camera upcoming won't have it. It will be a resolution monster just like the "e" as well as a huge seller for Sony.

It's not an artifact, it's a pixel unblurred, just as if you'd put a loupe up to your monitor. The more pixels, the higher the res. Pretty simple stuff.

The companies are eliminating the AA filters because at the current resolutions the chances of moire patterns are very few and far between. Even hair is often outresolved by the current sensor at the typical head and shoulders scale.

Nevertheless, theoretically the moire is still possible, it's just that in practice the number of subjects that can display it has diminished greatly. In your examples you can see stepping edges in the diagobals of the balance scale and in parts of the brush. Foveon is not immune to it either, especially the earlier, 5MP versions.

So it's not a question of whether the method is good or bad, but whether the benefits outweigh the disadvantages for each given sensor resolution. Until the Bayer sensors hit 16-24 MP the benefits of the AA filters were too significant to eliminate them.

Vlad

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