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11/07/2006 05:58:28 PM · #1 |
Hi. I have an odd thing going on with my camera. I'm not sure if it is a problem or not, but it's odd.
To illustrate the problem, I have this shot, which I ventured outside to take. It's a shot of the night sky with the moon in it, but that's not really important, because you can't tell that that's what it is. The significant thing is the gridlines that I can see across the photo. I know for a fact that the sky is not made up of neat gridded patterns, so I'm wondering where this grid comes from.
Is my camera broken? Is this grid a result of extreme contrast adjustment in post and not something to bother about, or is it symptomatic of something else? I find it hard to believe that it is "noise", because it's very regular.
Anyone seen anything like this before?
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11/07/2006 06:03:12 PM · #2 |
| Woah, that's really weird...I've never seen that happen before... |
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11/07/2006 06:07:28 PM · #3 |
Have you tried a different CF card?
Does it look like that on the view screen? |
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11/07/2006 06:13:16 PM · #4 |
Do these lines appear in lower ISO settings? I'm wondering if its due to noise or something. (Grasping at straws I guess)
*OOPS! You were using ISO 100 which is pretty low...I guess thats not it...*
Message edited by author 2006-11-07 18:14:04. |
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11/07/2006 06:24:18 PM · #5 |
Could it be some totally weird bokeh??
Maybe try to take a shot with a large DOF and one with a really shallow one and see if there's any difference? |
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11/07/2006 06:40:01 PM · #6 |
That's the "Google Earth" machine, looking down at you and taking a photo of you and your house.
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11/07/2006 06:53:43 PM · #7 |
If you can post all the exif - focal length, shutter speed, etc, I have the same lense and a 20D and can try to replicate it. I'll post the results after the moon comes out. Also if you can tell me what adjustments/to what degree you made post processing would help.
Message edited by author 2006-11-07 18:54:16. |
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11/07/2006 08:06:33 PM · #8 |
Have you tried reseting camera settings to defaults?
Then format your CF card IN CAMERA.
Does this happen on every shot you take?
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11/07/2006 08:10:51 PM · #9 |
| The issue here is that the exposure has been pushed *way, way* up in post (or RAW conversion). The lines are sensor readout noise, and it's normal to see some banding in that noise. |
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11/07/2006 08:11:19 PM · #10 |
This has happened to me before, when shooting directly into a light source. I can't explain why or how it happens, but I think your camera is likely not broken. Mine has worked fine since the inital occurrence over a year ago.
I just kind of took it as a warning not to shoot too directly into a light source like the sun/moon, as I've heard that can damage the sensor.
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11/07/2006 08:20:48 PM · #11 |
While waiting for the moon I shot the street light across the street. F11, ISO 100, 28-135 and boosted the contrast and came up with a decent abstract.
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11/07/2006 08:28:00 PM · #12 |
Originally posted by kirbic:
The issue here is that the exposure has been pushed *way, way* up in post (or RAW conversion). The lines are sensor readout noise, and it's normal to see some banding in that noise. |
I was thinking, he didn't mention whether it was the in-camera processing (JPEG output) or was it visible even in RAW? |
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11/07/2006 09:26:43 PM · #13 |
The moon showed up.
Boosted the crap out of the contrast in RAW.
This is the same photo, JPG, 100% boost in contrast, Elements 4
These two photos were RAW+Large JPEP from one single frame.
I don't think your camera is broken!
Edit again for ISO100, F11, About 1.3 Sec, Handheld, 28-135
Message edited by author 2006-11-07 21:34:16. |
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11/08/2006 02:26:31 AM · #14 |
Interesting. Kawesttex's photo shows the same mini-banding, but not the wider gridlines. I still wonder.
The actual sample photo that I put up was from a JPEG in camera image. In order to see the larger-spaced lines most clearly on my home monitor from a raw, I would import it +4 exposure, least possible contrast, least shadow.
The smaller lines show up even on a normally exposed night-time photo if I just lighten shadows. Is it normal for night time photos to do that? The effect then is less pronounced, more like how Kawesttex's example is.
I guess I'll just have to be more careful with any direct-light and night-time shots, not to overdo the exposure.
Thanks for everyone's perspective :) |
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