Fresnel or Moiré interference pattern
Jan 19, 2020 21:50:33 #
I need some suggestions:
I photographed midtown Manhattan from uptown Central Park to grab evening photos of the skyline.
The NEF (RAW) images in Lightroom looked fine, but when I exported the images to JPG, an interference pattern reminiscent of Moiré pattern interference waves were imposed on the final images - ALL of them.
Why is this happening and how can I prevent it from recurring?
Attached is a sample. I see the interference pattern seems less pronounced in this sample, but it is there.
Any suggestions are gratefully welcome. Thanks in advance.
TJ
I photographed midtown Manhattan from uptown Central Park to grab evening photos of the skyline.
The NEF (RAW) images in Lightroom looked fine, but when I exported the images to JPG, an interference pattern reminiscent of Moiré pattern interference waves were imposed on the final images - ALL of them.
Why is this happening and how can I prevent it from recurring?
Attached is a sample. I see the interference pattern seems less pronounced in this sample, but it is there.
Any suggestions are gratefully welcome. Thanks in advance.
TJ
Jan 19, 2020 21:53:50 #
Jan 19, 2020 22:01:44 #
Jan 19, 2020 22:50:48 #
Traveller_Jeff wrote:
Excellent questions: No and No. Thanks for replying.
Jeff
Jeff
Was it cropped or taken in live view?
If Live View I'd read up on the possible shortcomings of its focus points.
Those are just rhetorical questions, no need to reply.
Jan 19, 2020 23:04:33 #
Not cropped. Other images taken a bit earlier under slightly better light conditions did not show this interference.
Jan 19, 2020 23:25:36 #
Definitely visible to me and looks like examples in articles I've read about moire.. I've read suggestions like downsizing using a different method, using smaller aperture, tilting the camera to a different angle, using a different focus point. No actual experience though, so hopefully some help will arrive.
https://photographylife.com/what-is-moire
https://www.cambridgeincolour.com/tutorials/image-resize-for-web.htm
https://photographylife.com/what-is-moire
https://www.cambridgeincolour.com/tutorials/image-resize-for-web.htm
Jan 20, 2020 05:43:30 #
w00dy4012
Loc: Thalia, East Virginia
Traveller_Jeff wrote:
I need some suggestions: br br I photographed mid... (show quote)
I believe the processing may have something to do with it. If you reprocess it, try using less vibrance and/or sharpening or open up the shadows as much.
Jan 20, 2020 06:00:58 #
I have had that show up in high ISO shots before too and not solved how to clean it, once it is there. I do make sure I use a tripod and keep my ISO much lower.
Jan 20, 2020 07:08:58 #
What a pity - but I don't think it is moire. I feel sure it is a lens/filter problem rather than a sensor/camera problem. Have you moved pixels about - like straightening the verticles? This might be the problem - introduced when editing. 
Jan 20, 2020 08:40:33 #
Traveller_Jeff wrote:
I need some suggestions: br br I photographed mid... (show quote)
I vote for a filter problem, especially since it shows up in ALL your images.
Jan 20, 2020 08:58:14 #
Could be as a result of noise, underexposure, or over-sharpening?
Jan 20, 2020 10:42:12 #
I'm thinking that ISO 12800 at "wide-open" and the end of the zoom range may have something to do with it.
Jan 20, 2020 10:47:51 #
MT Shooter wrote:
I vote for a filter problem, especially since it shows up in ALL your images.
Not all. Just the ones in that cH series of about 11 shots. None of the others (around 400) were affected. Later on, on close inspection, I saw traces of it in the 11 NEF images, and the processing increased the moiré effect. But, no, I used no filters at all. I’m reading some research on moiré in photography and how to deal with it in post-production. Thank you to the Hogger who suggested going that route. And thanks to all of you who offered your insights and suggestions. Great team!
Jan 20, 2020 10:59:13 #
[quote=Traveller_Jeff]Not all. Just the ones in that cH series of about 11 shots. None of the others (around 400) were affected. Later on, on close inspection, I saw traces of it in the 11 NEF images, and the processing increased the moiré effect. But, no, I used no filters at all. I’m reading some research on moiré in photography and how to deal with it in post-production. Thank you to the Hogger who suggested going that route. And thanks to all of you who offered your insights and suggestions. As you can see from the following entry, there was no problem with that gull image below.
Jan 20, 2020 11:21:22 #
MT Shooter wrote:
I vote for a filter problem, especially since it shows up in ALL your images.
Along that line ["filter problem" ?], but
slightly different ... does the lens have
a nearly flat, or barely curved, element
at the back ? Might be an interference
pattern from light bouncing between
the sensor and rear surface of the lens.
If so, makes sense that it's stronger in
the shadows. And if this is the case it
would not help to angle the camera at
a different angle :-(
Also, if you wet cleaned the sensor and
left some sort of film on it maybe that
is producing an interference layer.
As to "filter problem", nothing mounted
to front of the lens can do this. Even if
you had cemented elements separating,
which will show such a pattern looking
thru the lens [off the camera], lenses
with that problem do not render it as
plainly visible at the image plane.
You do have an unusual problem. Send
the pix to the maker's support unit and
ask them about it.
If you want to reply, then register here. Registration is free and your account is created instantly, so you can post right away.