Moiré disaster on the E-5

Started Jul 10, 2013 | Discussions thread
John Sheehy Forum Pro • Posts: 20,896
Re: Not exactly ...

Airmel wrote:

Great Bustard wrote:

...the simple fix is more pixels. which so many fight against. The more pixels the sensor has, the weaker the AA filter needs to be to avoid aliasing.

All other things being the same, the use of a higher resolution sensor ("more pixels") requires Anti Aliasing with a correspondingly higher cutoff frequency.

It's hard to tell why you're saying this.  You said the same thing as the Great Bustard, but in different words.  An infinite cutoff frequency would be no filter at all.

The issues are so simple when you put your DSLR or 4/3 lens on a camera like the Pentax Q with an adapter; you can simulate what you system would be like (at least in the center of the frame) with hundreds of MPs; no significant spatial artifacts, and a virtually analog capture of the lens projection with only lens issues remaining.  The images look much, much more natural and artifact-free, than cropping from the same lens with the camera made to work with the lens (large sensor with coarse pixels).

The fact is, in their sweet spots with good technique, DSLR and 4/3 lenses can have far too much resolution for their sensors.  Those who claim otherwise are generally people who ENJOY aliasing artifacts, and can't tell them from accurate, natural imaging due to a weak right hemisphere.

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