How does Leica handle morie?

[Anthony MD]

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Just recently found out the MD262 doesn’t have an Anti Aliasing filter.

How then does Leica solve the moire problem in its images…?

Edited April 3, 2024 by Anthony MD

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[Luke_Miller]

I rarely see it with my M240, but if it occurs my processing program will clear it up.

Edited April 3, 2024 by Luke_Miller

[jaapv]

Most cameras nowadays have no AA filter any more. 

[adan]

On 4/3/2024 at 5:35 AM, Anthony MD said:

Just recently found out the MD262 doesn’t have an Anti Aliasing filter.

How then does Leica solve the moire problem in its images…?

Leica ignores it, for the most part.

Unless one photographs a lot of consistently repeating patterns of fine detail (brick buildings, cloth threads), it rarely shows up in "real-world" pictures.

Leica decided early on (in the Digital Module R and the original M8 - 2004 and 2006) that preserving the high resolution of Leica lenses was more important than avoiding moiré with a "blurring" anti-aliasing filter. And as Jaapv notes, many other camera makers are now following Leica's lead.

A higher-pixel-count sensor will reduce the chance of moiré - one of the very few situations where a sensor can, and needs to, "outresolve the lens."

See also the Nyquist-Shannon sampling theorem: https://en.wikipedia.org/wiki/Nyquist–Shannon_sampling_theorem

So the 60-megapixel M11/Q3/SL3 cameras might count as one way Leica is "solving the moiré problem."

In tests with the M11 vs. my M10 (24 Mpixels) the M11 definitely avoided moiré in some situations where the M10 produced it.

Example below - finely-ribbed texture of a white camera case. M10 crop, inset into identical crop from M11, 50mm Noctilux at f/4 (left-hand color splotches are just high ISO noise - 32000 for both images)

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Edited April 19, 2024 by adan

[M11 for me]

Just a side note: Often moiré just shows up on a screen. When zooming in or out that effect might disappear immediately as it is created by the screen and is not part of the photograph.

[fotomas]

My M 240 is now nearly ten years old. Since there is no way to see how many exposures was taken I can only guess. Could be around 50,000 pictures. There is only one of them I remember where I had a moire-issue.

So I clearly prefer this against an camera with an AA filter. We had some old Nikon's that had one and the pictures always looked unsharp if you not stop down to at least f 5.6.