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Olympus OM-D E-M1 The first Micro Four Thirds camera that offers phase detect focusing so you can use Four Thirds DSLR lenses normally as well a Micro Four Thirds lenses.

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Old 28th October 2017
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Interference Fringes?

This shot of some industrial buildings was captured using my E-M1 Mk1 and ED 150-300 lens at 140mm FL.


http://e-group.uk.net/gallery/uploads/165/buildings.jpg


The buildings are covered in corrugated sheeting. They are about 2,200 metres from the camera.

On the grey building, these green and magenta bars appear.


http://e-group.uk.net/gallery/uploads/165/detail1.jpg


In other images at a slightly longer FL, the blue coloured sheeting also has green stripes.

What causes these stripes? I take them to be interference fringes.

Would a camera with an AA filter avoid this proble?

I would appreciate any comments.
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Old 28th October 2017
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Re: Interference Fringes?

I suspect the answer is not interference but Moire, which is what an AA filter is designed to prevent.
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Old 29th October 2017
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Re: Interference Fringes?

The first could be chromatic aberation.

The second is certainly moire, a great example.
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Re: Interference Fringes?

Thanks for that.

I was thinking moire too, next time I go there I will try to remember to take my GX7, which has an AA filter, and see how that works.

The images it produces always seem to be as sharp as the E-M1, so I am not so sure about the no-AA-filter fashion is a good idea.
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Old 29th October 2017
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Re: Interference Fringes?

What is Moire?

Sorry to be ignorant...
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Re: Interference Fringes?

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What is Moire?

Sorry to be ignorant...
https://www.picturecorrect.com/tips/...-to-remove-it/
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Re: Interference Fringes?

IIRC some editing software handles moire better than other packages. Maybe try a different editor.

And I seem to think that you can still get moire using a camera with an AA filter.
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Re: Interference Fringes?

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That's what they call it............The accent on the last e makes le difference..........
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Re: Interference Fringes?

My title "Interference Fringes" refers to what I learnt in O-level Physics in 1956.

They are as know more commonly known as Moiré fringes, that being the name of a silk material that shows this phenomenon.

https://en.wikipedia.org/wiki/Moir%C3%A9_pattern

My Physics master wisely left that bit out.

I have experienced it before - dark and light stripes on a tiled roof pattern, but never before in this colour scheme.
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Old 30th October 2017
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Re: Interference Fringes?

After the recent exchanges on this subject, I consoled myself with the thought, that my digital image collection has some 71,000 images, and the Industrial building image was the first that I had found unusable due to Moiré.


Then at Seaham yesterday, I did some shots of the waves breaking over the harbour wall:


http://e-group.uk.net/gallery/uploads/165/seaham4.jpg


On close examination, this fence has blue and yellow Moiré:


http://e-group.uk.net/gallery/uploads/165/moire2.jpg


This shoot was a trial run, as I hope to go there again when the waves are much higher.

There was some sun shining when the image was shot, would the Moiré be less if the sky was overcast?

When I eventually get to shoot the big waves, I plan to use a viewpoint further along the coast, more square on to the lighthouse, that should eliminate that fence from the image. Good job I had this trial shoot.


I would appreciate any further comments please.
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Re: Interference Fringes?

Hmm. I am not sure that it is moiré that is causing that effect. It is very strange have to say.

The images are very small could you share the original raw file if you have one ?
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Re: Interference Fringes?

I have shown these images by uploading to the gallery where they are jpg's limited to 800px wide.

I am willing to share a copy of the original RAW file, but how do I do that please?
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Re: Interference Fringes?

Interesting phenomena, whatever the cause.
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Lightbulb Re: Interference Fringes?

I think this is Diffraction in much the same way you get coloured bands reflected from a CD. The light reflected off the corrugated panel or the light passing through the railings is defracted by virtue of the distance that they are viewed from.

https://www.olympus-lifescience.com/...r/diffraction/

"In optics, the Fraunhofer diffraction equation is used to model the diffraction of waves when the diffraction pattern is viewed at a long distance from the diffracting object, and also when it is viewed at the focal plane of an imaging lens"

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Re: Interference Fringes?

Quote:
Originally Posted by Pjphoto59 View Post
I have shown these images by uploading to the gallery where they are jpg's limited to 800px wide.

I am willing to share a copy of the original RAW file, but how do I do that please?

Can you put them on dropbox and share the link ?

or if you have a Flickr account you could post them there.

You can actually post images to the gallery here with sizes greater than 800px long edge as long as the overall image size doesn't exceed 500Mb.

Even a 2000px long edge would help diagnose the issue.



If you cant do the above I can pm you my email address, and then you can use the site below to send the image to my email address.

https://wetransfer.com

let me know.

Its interesting to try and find the cause.
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