Which cameras have an optical low-pass filter (for anti-aliasing)?

Started 5 months ago | Discussions thread
Paul De Bra
Paul De Bra Forum Pro • Posts: 12,796
That's what no AA filter + sharp lens gives.
5

An AA filter is simple a "blurring filter", but one that blurs just around the pixel level on the sensor. You do want the green and blue pixels to capture a bit of the light from the nearest red pixel when the light is pure green or blue, and then all the permutations of this. With a super sharp lens a perfectly straight one pixel wide horizontal or vertical line in one color can disappear completely from an image and a diagonal one can become a dashed line...

In almost all cases the slightest bit of unsharpness caused by a lens is enough to avoid the lack of an AA filter resulting in Moiré, but when you have a super-sharp lens it can be Moiré galore! I prefer having a super sharp lens + an AA filter over less sharp (consumer-grade) lens and no AA filter. The AA filter does a much better job at spreading light over just the adjacent pixels than an unsharp lens.

I have seen Moiré just like yours, on finely detailed textured textiles. It's a pain to go over each image and selectively apply a Moiré filter in software.

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Fujifilm FinePix F200EXR Olympus OM-D E-M5 Olympus E-M5 II Panasonic Lumix G 20mm F1.7 ASPH Olympus M.Zuiko Digital 45mm F1.8 +3 more
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