Lines on Photos?!?!

PJwebbs

PJwebbs

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Name
Paul
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Lately I have begun to notice lines across some of my photos from GX7 and i was wondering if anyone might be able to shed some light on what happening?!? If you look at the photo below I took to demonstrate, the lines appear to go horizontally across and are light then dark. These don't occur all the time, just occasionally and it seems they only happen when using the electronic shutter rather than the mechanical, which in its self seems strange to me as the electronic shutter goes all the way up to 8000th sec, faster then the mechanical. The photo was not taken using flash, Shutter - 1/640, ISO 2000, f1.8, 45mm.

P1290488 by pjwebbs, on Flickr
 
Was there fluorescent lighting?
 
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It is because of how the electronic shutter works.
The exposure might be 1/640 sec, ie each pixel is exposed for that time, but each line is scanned as the shutter (in effect) moves down the sensor- typically 1/40 sec.
This can cause banding under certain lighting, especially fluorescent with a flicker rate of 1/40 second :)
 
Fluorescent lighting problems don't look like that though - they flicker too slowly.

Can you replicate the effect, preferably of a plain wall, with a mechanical shutter shot for comparison? With full lighting details.
 
It seems reasonable, but I'll bow to your wisdom :) It looked like it to me.
We still don't know what light source was used...
So, what do you reckon it is, Richard?
 
kendo1 said:
It seems reasonable, but I'll bow to your wisdom :) It looked like it to me.
We still don't know what light source was used...
So, what do you reckon it is, Richard?
Click to expand...

Fluorescent light, at that kind of shutter speed, only shows part of the cycle, or parts of two cycles, and results are inconsistent. Usually darkening over part of the frame, and a colour cast, but not clearly defined and regular stripes like that.

If it's a lighting effect, it's something flickering extremely fast, like a few thousand times a second. Or it could be the electronic shutter playing up. In fact, it must be the electronic shutter if indeed the effect doesn't happen in mechanical shutter mode, as stated. Need confirmation of that, and more info.
 
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I got the same on my XT1 over Xmas, when in as using only the electronic shutter, in mechanical it was fine. I put it down the the lights in this case LED bulbs
 
HoppyUK said:
Fluorescent light, at that kind of shutter speed, only shows part of the cycle, or parts of two cycles, and results are inconsistent. Usually darkening over part of the frame, and a colour cast, but not clearly defined and regular stripes like that.

If it's a lighting effect, it's something flickering extremely fast, like a few thousand times a second. Or it could be the electronic shutter playing up. In fact, it must be the electronic shutter if indeed the effect doesn't happen in mechanical shutter mode, as stated. Need confirmation of that, and more info.
Click to expand...

You seem to know more on it than me, but I'd be absolutely amazed if it wasn't due to the electronic shutter and fluorescent lighting.

The example he posted is identical to all of the Fuji XT1 examples I've seen since their latest firmware included the option to use electronic shutter...
 
UaeExile said:
You seem to know more on it than me, but I'd be absolutely amazed if it wasn't due to the electronic shutter and fluorescent lighting.

The example he posted is identical to all of the Fuji XT1 examples I've seen since their latest firmware included the option to use electronic shutter...
Click to expand...

I wouldn't say that exactly. What it's not, is the effect you normally get with a faster shutter speed in fluorescent light with a focal plane shutter. But the electronic shutter may be different. They scan down the frame light a mechanical shutter, though TBH I don't know exactly the order in which the rows of pixels scan, or if it differs with different cameras.

It seems to be related to the electronic shutter in some way, so you could well be right. Sorry if I didn't make that clear. I have a couple of cameras with an electronic shutter option, I'll see if I can get something similar :)
 
Despite my best efforts, I can't replicate the OP's image with fluorescent lights and electronic shutter, not on my Canon 5D2 (electronic first curtain) or Nikon V1 (full electronic mode). Nothing like it, just the expected colour and exposure shifts part-way down the frame.

Interestingly though, with the Canon in live view, there are lines rolling down the frame that look very like the OP's image - just can't capture them in an image. So I'm inclined to think that maybe the GX7's electronic shutter (and Adam's Fuji) scans differently to create the effect. Need more info from the OP, and if Adam can throw any more light on it, that would be interesting to see :)
 
This is an Electric shutter banding issue which manifests under fluorescent and neon lights has been identified as a problem on the GX7, GH3 and also the Sony A7 on occasions. On the GH3 it's more common when the camera is switched to silent mode.

The phenomena occurs when the lighting changes phases the shutter does not record the image in one go but in a series and then binds them together as a final image which shows the fluctuation of light as a band.

Try shooting at a slower shutter speed at say 1/60 ( turn the silent mode back on if it's off) and see if that makes a difference ?
 
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Blank_Canvas said:
This is an Electric shutter banding issue which manifests under fluorescent and neon lights has been identified as a problem on the GX7, GH3 and also the Sony A7 on occasions. On the GH3 it's more common when the camera is switched to silent mode.

The phenomena occurs when the lighting changes phases the shutter does not record the image in one go but in a series and then binds them together as a final image which shows the fluctuation of light as a band.

Try shooting at a slower shutter speed at say 1/60 ( turn the silent mode back on if it's off) and see if that makes a difference ?
Click to expand...

Sounds like the answer (y) Scroll down this link, GX7 review http://www.bestmirrorlesscamerarevi...to-rule-them-all-a-panasonic-gx7-full-review/
 
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