D600 Moire???? How to avoid this in the future?

Started Sep 12, 2013 | Discussions
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vbuhay
vbuhay Senior Member • Posts: 2,736
D600 Moire???? How to avoid this in the future?

Did a wedding shoot of my nephew last weekend in Oregon. Had both the D600 w/24-70 f2.8G and the D7100 with 80-200 f2.8D + 14-24 f2.8. Shot about 1200+ frames in about 11 Hours. Both Camera and all lenses performed without a fault except.... maybe for several frames had some Moire. See attached 2 consecutive frames. Frame 0599 shot at 36 mm and the next one at 50mm with the Moire. I used a SB800 as a flash and the D600 + 24-70mm f2.8G on these 2 shots.

With all the experience and knowledge in this forum, can anyone answer how this happened and how I might avoid it in the future?

D600 36mm, 1/125 sec, f7.1, ISO 500, -0.33 - No Moire

D600 50mm, 1/125 sec, f7.1, ISO 500, -0.33 - with Moire ???

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Brigcam Regular Member • Posts: 163
Re: D600 Moire???? How to avoid this in the future?

All cameras with a bayer filter are prone to moire if the conditions are right.  The only way to completely avoid it is to get a camera with a Foveon sensor, but they have their own set of problems.

Its fairly easy to fix in post, besides moving in or out a bit as you did in this case will also remove the problem.

goosel
goosel Senior Member • Posts: 1,820
Re: D600 Moire???? How to avoid this in the future?
3

Stopping down should have helped in this situation.

Kaj E Veteran Member • Posts: 9,262
Re: D600 Moire???? How to avoid this in the future?

Moire is a risk with any digital camera. The good news is that you can reduce or perhaps even completely remove it in post processing: http://photographylife.com/how-to-remove-moire-in-photoshop

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MisterHairy Senior Member • Posts: 2,183
Re: D600 Moire???? How to avoid this in the future?

This is untrue. Any process which involves a transfer from the analogue domain to the digital domain runs the risk of aliasing (which moiré and false colours are) if inadequately protected by low pass filtering. The Bayer filter plays no part in aliasing.

Brigcam wrote:

All cameras with a bayer filter are prone to moire if the conditions are right. The only way to completely avoid it is to get a camera with a Foveon sensor, but they have their own set of problems.

Its fairly easy to fix in post, besides moving in or out a bit as you did in this case will also remove the problem.

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BasiliskPhoto Senior Member • Posts: 1,008
Re: D600 Moire???? How to avoid this in the future?

goosel wrote:

Stopping down should have helped in this situation.

Would be interested in hearing the reasons for this - my understanding is that the sharper the image the greater the risk. Unless you stop down to the point where diffraction kicks in and softens the image that way - but f22 isn't always a practical setting (as well as highlighting sensor dust!)

The moiré occurs when you take a picture of a fine repeating pattern (e.g. woven fabric) where the individual lines of the pattern are roughly the size of your pixels. A slight mismatch between the image grid and the pixel size can cause interference patterns which are visible as moiré. You have discovered the solution. Zoom out by a bit (or step back) so the image pattern and pixels are less closely matched and the moiré disappears. You may need to crop a bit in post, but you have plenty of resolution to spare with modern sensors. I guess the advice in critical situations, where you don't have time to review pictures, is always take a few shots with different focal lengths in each scenario - it is unlikely more than one of them will have a serious problem.

John Motts Veteran Member • Posts: 5,206
Re: D600 Moire???? How to avoid this in the future?

goosel wrote:

Stopping down should have helped in this situation.

No, this would not help.

Besides, he's already at f/7.1. He should be thinking about getting more ambient light in there, not less, in order to reduce the effects of using direct flash.

To the OP, if you really can't bounce the flash, then don't be afraid of upping the ISO to use more ambient light.

Brigcam Regular Member • Posts: 163
Re: D600 Moire???? How to avoid this in the future?

Sorry meant the rainbow color moire, that was shown in his photo.

vbuhay
vbuhay OP Senior Member • Posts: 2,736
Re: D600 Moire???? How to avoid this in the future?

Thanks to all responses, it looks like the best way to go forward is to fix the image in post.

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(unknown member) Senior Member • Posts: 2,216
Re: D600 Moire???? How to avoid this in the future?

If you think about how colour moiré happens, this kind of low-frequency artefact happens when the pitch of the fine lines is close to the pitch of the Bayer CFA, so what has happened here is that the second shot has just matched this condition giving highly visible colour fringes.  The aliasing artefacts will be there in the first photo, but just not highly visible and intrusive, i.e. it was just a bit of bad luck! The cloth is grey, so desaturating the coloured pattern may help to make it less visible...

Joe

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