[Winder]

I know insect eyes have a pattern that could trigger moire, but as Falk pointed out, you will likely be into diffraction aperture range for extreme macros, so your lens will break up the moire.

I initially thought bird feathers may be a problem, but I read somewhere that they weren't. Have you experienced this?

I don't shoot a lot of wildlife. Moire in feathers is common with cameras that have AA filters. Feathers are a standard test and included in DPR and IRs test shots because they can trigger it.

File:Moire on parrot feathers.jpg - Wikipedia, the free encyclopedia

All sizes | Bluebottle flies #2 | Flickr - Photo Sharing!
Look at the eyes.

[JinDesu]

I'm curious. Wouldn't moire show up on downsizing of files? I have a picture of a NEX 18-55 zoom where the moire shows up on the zoom ring when looking at the 700x400 pixel version, but not when blown up.

Any input?

[beholder3]

[[deleted]

[vonBaloney]

And this is why a good theory is so practical. One can predict that moiré will occur, so if it doesn't in practice, you know that you have to try harder.

While empirical results always trump theory, this is only true for thoroughly created and hence reliable results. And boy, are the latter hard to produce.

If you want to create moire on demand, common window screens found in most of our own dwellings will do. Focus on it at a slight angle -- distance depends on the lens in order for the pattern to be fine enough.

[JinDesu]

To put it simply in inprecise words: Moire is "how sharp structures in subject vs. sharp structures in sensor and viewing equipment interfere".
If the downsizing algorithm does create sharp structures then you have a chance of seeing them. If it blurs the picture then not.

Best to see how things are is to take this file: http://www.northlight-images.co.uk/downloadable_2/pattern_4.zip and play around with it:
display it in different magnifications, watch it through a matte focussing screen, take pictures of it with different cameras, cell phone and distances. You will pretty much always see some degree of moire. No need for a aa-less camera.

So what I mean is - these pictures that we see online that aren't full resolution: couldn't the moire just be a result of the downsizing algorithm? For my example image:



When you click the image for full resolution (well, larger anyways) - the moire is gone. But because of how the image is reduced and interpreted, the moire is shown. I think we may have to be a little picky when selecting images that represent moire.

If you want to create moire on demand, common window screens found in most of our own dwellings will do. Focus on it at a slight angle -- distance depends on the lens in order for the pattern to be fine enough.

The humorous part is that I walked by a bunch of window screens left on the street yesterday, and with my naked eye looking at them from an angle, it looked like patterns galore. I do not doubt the camera would capture the same.

[beholder3]

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[JinDesu]

Yes, they can: As I wrote: moire is interfering patterns and each computer screen also has a pixel pattern. That is why I also can see slight moire if watching the pattern through my s-type focussing screen (which has circular patterns on it), even though no sensor or electronics is involved on the second part.

If you use an EVF you will also necessarily get to see moire which will not be on the final picture because the specific pattern of the EVF pixels will interact with the subject patterns in a slightly different way to the sensor, just as your sample picture.

Thanks - I think all who post in this thread should really keep that in mind. Grabbing random pictures on the web to represent moire without considering that the moire could be created by an aggressively sharp downsizing algorithm will not help understand how common or uncommon moire is with other cameras.

[beholder3]

[deleted]

[audiobomber]

File:Moire on parrot feathers.jpg - Wikipedia, the free encyclopedia

All sizes | Bluebottle flies #2 | Flickr - Photo Sharing!
Look at the eyes.

These are examples of nature causing moire alright, but the parrot feathers were sharpened to enhance the moire. The fly photo needed to be stopped down a lot more for reasonable DOF.

[froeschle]

NIKON:

Every potential customer of the D800E has to be informed about possible problems.
This is a commandment by Nikon.
If this information is veritably skipped by any sellers, they will not be provided with the E-version by Nikon anymore.

• Nikon D800E tips
• Anti-alias or Moiré?
• 36 Megapixel Without an Anti-Aliasing Filter?
• Nyquist-Shannon sampling theorem

[Class A]

So basically, wherever you look, not a single well argumented serious source recommends having the aa filter for advanced photographers.

I don't want this thread to deteriorate into a tedious debate (which is why I so far resisted the temptation to put some things right regarding your first post here).

However, I willl object to your statement I quoted.
"Advanced Photographers" (however that term may be defined) do not have a reality distortion field that changes Physics according to their needs. If you want to say that a photographer who knows what they are doing has ways to address moiré (both during and after shooting) then that's a different matter.

[ironlionzion]

which is why I so far resisted the temptation to put some things right regarding your first post here

You should. Seeing as the K5iis is about to go in stock, it would be useful if people would actually know what the hell they are buying. It's a little worrysome having false information floating about.

[kh1234567890]

Looking at some of the K-5iis photos posted on Flickr, there seems to be plenty of moire on shots from this camera - even on the not so sharp ones

[JinDesu]

Looking at some of the K-5iis photos posted on Flickr, there seems to be plenty of moire on shots from this camera - even on the not so sharp ones

If it's on the "not so sharp ones" - then most likely AA cameras will show the same moire...

[Ecaterin]

As an owner of several cameras without Aliasing filters ( Leica M8,M9,Leica Monochrom,Pentax 645D) I find the results I get from these cameras perfectly acceptable, I prefer them over cameras with Aliasing filters because I don't have to spend much time sharpening files, and they preserve the qualities of the lenses the images were taken with. [...]

I, too, will keep chiming in on these "no AA filter OMG!" threads along with the other users of non-AA filter cameras and say that under real world shooting conditions (portraiture, landscape, you name it) I have yet to see moire on anything shot with my Fuji X100.

We all know there's a huge difference between controlled testing and real life - and I'll gladly take the rare chance of a moire noticeable enough to need correction against thousands of fantastically sharp images right out of the camera every time.

(and good gracious, Digitalis, I want your camera line-up! Droooool! .....nah, I'd just take your Monochrom and run with it )