Befuddled
Oct 21, 2023 00:11:25 #
JRD3
Loc: Richmond, VA
These two shots were taken among about 400 last night at live music performance. Of that number, maybe six showed these clear lines of color. the one with the strongest lines was done at ISO 6400 (1/4000th) and the other at ISO 3200(1/800th). Both at f 4 at 66 mm. Camera is Z 6 ii, with 24-70mm, f 4 Z lens. camera is just bought from Nikon as refurbished. Over the course of the last week, have taken about 650 images with this camera.
Is this some frequency of the lighting system the band uses? This only shows in performance of the second of the two bands.
Is this some anomaly with the sensor?
Thoughts or suggestions.
Is this some frequency of the lighting system the band uses? This only shows in performance of the second of the two bands.
Is this some anomaly with the sensor?
Thoughts or suggestions.
Oct 21, 2023 06:02:44 #
Oct 21, 2023 06:39:03 #
That kind of interference needs a frequency that's far higher than what LED lighting operates at, but it's possible that an RF control signal could do that. It would also need a frequency that was coincidentally exactly the same as one of the frequencies that the camera uses internally. It's more likely to be an intermittent fault (which may be triggered by interference but it's more likely to be triggered by something physical).
Oct 21, 2023 06:41:27 #
Oct 21, 2023 06:47:30 #
It could be caused by LED lighting. Do you know if that was the case? Also banding can be caused by high shutter speeds and slow readout of your sensor. If the lights are run by typical 60 Hrz. U.S. 120VAC current a shutter speed of about 125th of a second should clear up the problem
Oct 21, 2023 06:51:27 #
R.G. wrote:
That kind of interference needs a frequency that's far higher than what LED lighting operates at, but it's possible that an RF control signal could do that. It would also need a frequency that was coincidentally exactly the same as one of the frequencies that the camera uses internally. It's more likely to be an intermittent fault (which may be triggered by interference but it's more likely to be triggered by something physical).
It is possible that the power supply for the stage lighting is verrrry high frequency, way above the 60hz of household lighting.
I hafta wonder whether the affected frames are the end frames of bursts that at or near the limit of the buffer such that the readout speed was less than optimal
Oct 21, 2023 06:52:58 #
User ID wrote:
It is possible that the power supply for the stage lighting is verrrry high frequency, way above the 60hz of household lighting.
. It would have to be way higher. Switched power supplies or RF control signals are the most likely suspect.Oct 21, 2023 07:00:42 #
R.G. wrote: . It would have to be way higher. Switched power supplies or RF control signals are the most likely suspect.
. It would have to be way higher. Switched power supplies or RF control signals are the most likely suspect.Switched power supplies can be quite high frequency, favored as lite weight substitutes for very weighty copper-iron transformers.
Oct 21, 2023 07:19:42 #
Were you using silent mode? I learned from personal experience that silent mode and stage lighting can produce horizontal bars in the images. I had just gotten a Z7II and was seeing one of my favoite artists. Did not get a single useable image. I learned afterward (can’t recall the source) that this can happen. Don’t know the technical reason.
Oct 21, 2023 07:23:53 #
ClarkJohnson wrote:
.....silent mode and stage lighting can produce horizontal bars in the images....
Silent mode would mean electronic shutter - which could be susceptible to electromagnetic interference in a way that a mechanical shutter wouldn't be.
Oct 21, 2023 08:19:33 #
Exact same thing happened to me with my new Leica Q3. The very first shot I took has the same horizontal lines. It was the only time it ever happened. Never again since. It was in a room with Hue LED lights. Could not replicate it so it must have been a very well timed frequency issue.
Oct 21, 2023 08:22:16 #
FYI-
If you want people to be able to find the thread in a UHH search, you'd be better off with a title of something like "What is this banding in my photos?" instead of "Befuddled".
NO ONE will search for befuddled.
If you want people to be able to find the thread in a UHH search, you'd be better off with a title of something like "What is this banding in my photos?" instead of "Befuddled".
NO ONE will search for befuddled.
Oct 21, 2023 09:20:06 #
JRD3
Loc: Richmond, VA
Thanks. I, too, think that is the culprit. Silent seems to have an impact on a lot of features. For good measure, I think I will contact Nikon for feedback.
Oct 21, 2023 09:24:22 #
JRD3
Loc: Richmond, VA
Thanks for this. makes me feel better that it happened with a Leica. with the z 6 ii, it seems to be associated with silent mode which turns off flicker reduction. Frequency of the lighting set up may have contributed.
Oct 21, 2023 09:27:30 #
I would imagine that the software "scans" the sensor data in a row & column format.
So if the lighting changed during a "row" scan, that would account for the difference.
Kinda like a stroboscopic effect.
So if the lighting changed during a "row" scan, that would account for the difference.
Kinda like a stroboscopic effect.
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