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01-26-2008, 08:50 PM   #1
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K10D and weird noise pattern

Maybe Im just being paranoid or is this weird noise pattern suppose to show up in the K10D @ ISO600+? The issue(if it is an issue) shows itself where the light source sorta gradients.

The pic attached below was cropped @ 100% and was taken with:

Lens: Sigma 28-70 F2.8-4 DG
ISO1000
1/8th sec Shutter Speed
31mm
F2.8

Now am I being paranoid or is this normal? Help please!

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Last edited by quickpix; 01-26-2008 at 08:51 PM. Reason: typo
01-26-2008, 11:05 PM   #2
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which firmware are you using?
01-26-2008, 11:08 PM   #3
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Im using firmware V1.2
01-26-2008, 11:18 PM   #4
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What were the atmospheric conditions the night you shot this? Looks like there might have been fairly high humidity, which can catch and reflect enough light to provoke a sensor reaction that looks like high ISO noise at wide apertures and longish exposure times. High ISO films sometimes give a similar grainy result under these conditions, while looking smoother on clear nights.

BTW, your question asked about ISO 1600 performance, but your shot specs say you took the photo at ISO 1000. A typo?

01-26-2008, 11:20 PM   #5
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Probably because the lights are low pressure Sodium monochromatic and creating interference patterns with the sensor.

Just a guess.
01-26-2008, 11:32 PM   #6
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Christine: Yes that was a typo, it was suppose to be 600+

These were tonights shooting conditions:
Condition:
Mainly Clear
Pressure:
101.1 kPa
Temperature:
-16.4C
Dewpoint:
-18.2C
Humidity:
86 %
Wind Chill:
-22

This weird pattern appears in indoor photography as well when high ISO is neede like sports photography and stuff.
01-27-2008, 12:01 AM   #7
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I'll ask for another clarification, based on your response to my earlier post. Is the weird pattern you're referring to the "needle like" pattern visible around the light sources? If so, that's a form of flare, which often shows up when photographing bright light sources near to the lens axis.

If you were talking about the slightly blotchy light pattern between and well above the two bright lights, that's another matter. Rickster's guess is as good as my earlier one, there. Do you get something like that blotchy pattern when you shoot indoor sports?
01-27-2008, 12:36 AM   #8
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Its sort of like a blotchy finger print like pattern, similar to the pattern you get when you use the Bas Relief filter in PS. Maybe I need my sensor cleaned?

01-27-2008, 01:45 AM   #9
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Well, then, I think Rickster's post probably best describes the problem. The thing is, with low pressure sodium lights, you get a really narrow elemental emission of light at 589.0 and 589.6 nanometers wavelength and not much else. This means that conventional color correcting filters won't be of help.

My experience shooting around these lights is that your best strategy to reduce the interference pattern is to get away from nearby lamps, letting the inverse square law be your friend. Sorry there's nothing better I can suggest.
01-27-2008, 11:03 AM   #10
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Thank you Christine, and Rick! I'm just glad that theres nothing wrong w/ my K10D! Thanks again!
01-27-2008, 12:58 PM   #11
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Here is another example of the weird pattern I speak of. This was shot indoors ISO1600.
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01-28-2008, 10:48 AM   #12
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QuoteOriginally posted by quickpix Quote
Here is another example of the weird pattern I speak of. This was shot indoors ISO1600.
Could also be radio frequency interference. Got a cell phone near the camera?
01-28-2008, 11:14 AM   #13
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QuoteOriginally posted by quickpix Quote
Here is another example of the weird pattern I speak of. This was shot indoors ISO1600.
It's interesting, because I have gone back through about 1500 photos shot at 1600ISO with the K10 and I don't see anything like this.

I guess there are other questions,
are you boosting brightness at all or is this the uncorrected exposure?
is there any unfiltered light from a discharge source? Perhaps compact flourescent lights?

My first reaction was it was a thumbprint, but then looking at this photo it seems to be a very small crop out of a much bigger print.
01-28-2008, 03:45 PM   #14
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There was no PP on either picture posted. The first picture was cropped at 100% and the second cropped at 50%. Im thinking its a fingerprint on the CCD; the camera is in the Repair Shop right now getting the CCD cleaned. I hope thats fixes it. I hope its not CCD failure
01-28-2008, 03:56 PM   #15
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QuoteOriginally posted by Rickster Quote
Could also be radio frequency interference. Got a cell phone near the camera?
If that was a case my K110D would also be having issues haha. I usually have my Toshiba 904T w/ me, but the issue also happened on test shots I took; the 904t wasnt anywhere near my camera, and the issue still shows up.
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