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07-31-2009, 05:46 PM   #1
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Why these speckles at iso 100 in K-7 that wasn't there with the K10D



This is a 100% crop shot at iso 100 and yet there are speckles of black dots all over the place.This never showed up with my K10D. Is this the base noise that people (including Gordon G) were talking about ?

Is it the difference between CCD and CMOS sensors?

07-31-2009, 05:56 PM   #2
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It says in the exif ISO 200.

But either way, the shadows look pretty noisy...

Have you tried taking another shot after that and the same results? I was guessing that the sensor overheated or something.
07-31-2009, 06:10 PM   #3
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Sorry it was with iso 100 and with flash.

This is iso 100 with no flash, but was getting dark, so long shutter on a tripod.

07-31-2009, 06:18 PM   #4
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QuoteOriginally posted by pcarfan Quote
Sorry it was with iso 100 and with flash.

This is iso 100 with no flash, but was getting dark, so long shutter on a tripod.

My god... all these pictures are so noisy... Very different from the images I have seen. I'd suggest you go get a replacement!

07-31-2009, 06:27 PM   #5
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Well these are 100% crop from this image



so, isn't that normal for even the K20D ?
07-31-2009, 06:27 PM   #6
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I'm wondering if your surpassing the resolution of the lens that your using.

If you aren't using top notch glass how about trying your best lens, and see if it's any better.
07-31-2009, 06:47 PM   #7
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QuoteOriginally posted by little laker Quote
I'm wondering if your surpassing the resolution of the lens that your using.

If you aren't using top notch glass how about trying your best lens, and see if it's any better.
I guarentee you the image is not taken with a kit lens.

A return might be in order pcarfan.
07-31-2009, 06:50 PM   #8
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I think it is normal for dark regions. Signal to noise is not as good there. K-7 is not the only camera that does this. Go to the Imaging Resource comparometer and take a look at the "new indoor" iso 100. Go to the far right and look at the wall in between the green leaves. It is easiest to see there, especially where the focus is blurred because the wall is behind the focus point. k20d does it just as bad, or worse. You see it on the Nikon D300. I see some of it in the D700. Even the $8000 D3x does it. I think it also will vary based on the setting of the camera such as the sharpness setting as well as the NR setting. What are those set to on your camera? If sharpness is cranked up, it will even try to "sharpen noise."


Last edited by PentaxPoke; 07-31-2009 at 06:56 PM.
07-31-2009, 06:55 PM   #9
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I think the lens he is using is pretty "high quality". EXIF shows he is using a 21mm, and looking at his sig, I am guessing it's the 21mm f/3.2 LTD.
07-31-2009, 06:56 PM   #10
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Same shots taken with the K10D and the K-7. Same iso, shutter and aperture. K-7 AWB, K10D with Tungsten customized WB.

Jpegs from camera, but obviously the jpegs are processed differently in the body. The K-7 shot may not be in focus. K10D seems underexposed for some reason. Like the tone curve is different for the same exposure.

Can someone tell me whether this is normal.

K-7 100% crop


K10D 100% crop
07-31-2009, 06:57 PM   #11
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I don't know, that 100% crop of the shed is pretty rough. i agree, shoot with top glass and reevaluate. The images shouldan't be so noisy, rarely at 100 iso have I seen noise with my k20 close to that degree. Might be a bad copy or inadequate cooling of the sensor... I would send it in; it's a hassle but for that kind of cash you should't settle.

My two,

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07-31-2009, 06:58 PM   #12
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QuoteOriginally posted by PentaxPoke Quote
I think it is normal for dark regions. Signal to noise is not as good there. K-7 is not the only camera that does this. Go to the Imaging Resource comparometer and take a look at the "new indoor" iso 100. Go to the far right and look at the wall in between the green leaves. It is easiest to see there, especially where the focus is blurred because the wall is behind the focus point. k20d does it just as bad, or worse. You see it on the Nikon D300. I see some of it in the D700. Even the $8000 D3x does it. I think it also will vary based on the setting of the camera such as the sharpness setting as well as the NR setting. What are those set to on your camera? If sharpness is cranked up, it will even try to "sharpen noise."
Sharpness sure is maxed out in the K-7...thank you, thank you...let me check it with the default sharpness.
07-31-2009, 06:59 PM   #13
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Pentaxpoke could be on to something here. i would just set sharpness at zero and take care of the noise as you see fit during post processing.

owen
07-31-2009, 07:03 PM   #14
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QuoteOriginally posted by pcarfan Quote
Same shots taken with the K10D and the K-7. Same iso, shutter and aperture. K-7 AWB, K10D with Tungsten customized WB.

Jpegs from camera, but obviously the jpegs are processed differently in the body. The K-7 shot may not be in focus. K10D seems underexposed for some reason. Like the tone curve is different for the same exposure.

Can someone tell me whether this is normal.

K-7 100% crop


K10D 100% crop
Not looking good pcarfan.

Hows about some raw images?
07-31-2009, 07:16 PM   #15
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BINGO!

It was the sharpening settings. I put the jpeg settings to default and focused both cameras on the thermostat. Really appreciate this forum's help. Thanks.

K10D


K10D misses focus with the DA21 in low light most of the time.


K-7

Last edited by pcarfan; 07-31-2009 at 07:34 PM.
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