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05-25-2012, 11:30 AM   #1
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Pentax K-x High noise, even at ISO 100

I have noticed my K-x is giving more noise than what I have seen online at all iso ranges from 100-1600.

Even my videos seems to have more noise than the ones I have seen on youtube.

Could there be a problem with my sensor?

Here is a picture of clouds at ISO 100. I would expect this to be completely smooth, but there is still a small amount of noise

I am thinking the shot may be underexposed due to the P settings, but shouldnt it still be noise free at ISO100 ?

(100% crop) Was shot in P mode, so automatic settings. F/13 - 1/1000s - 55mm w/ 18-55 DA-L


Full Image here
http://www3.picturepush.com/photo/a/8336186/img/8336186.jpg

05-25-2012, 11:35 AM   #2
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Noise to signal ratio will always be higher if the picture is underexposed. I'm not saying you may not have a problem, but I'm afraid the picture you posted is irrelevant.
05-25-2012, 11:38 AM   #3
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QuoteOriginally posted by kcobain1992 Quote
Noise to signal ratio will always be higher if the picture is underexposed. I'm not saying you may not have a problem, but I'm afraid the picture you posted is irrelevant.
Here is a picture with +1 EV. (Top is out of the camera 100% crop, and bottom is after noise cleaned with NeatImage), turned off expanded sensitivity, so ISO 200 for these.



05-25-2012, 12:40 PM   #4
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Those still seem a little bit dark.

05-25-2012, 04:47 PM   #5
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Couple of things:

- remember you are viewing things at 100%... print the image and see if you can see anything worrisome at all;

- your shot is under-exposed;

- time to clean your sensor! The large version of your picture shows a big smudge on your sensor, possibly the result of a bad cleaning effort, which may also be contributing to your current problem:
Name:  sensor-mess.jpg
Views: 826
Size:  50.7 KB

- you've got your Custom Image setting for both contrast and sharpness set pretty high to Hard, which may accentuate the appearance of 'noise';

- time to update your firmware from v1.02 to v1.03. Always a good step.
05-25-2012, 07:37 PM   #6
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QuoteOriginally posted by rawr Quote
Couple of things:

- remember you are viewing things at 100%... print the image and see if you can see anything worrisome at all;

- your shot is under-exposed;

- time to clean your sensor! The large version of your picture shows a big smudge on your sensor, possibly the result of a bad cleaning effort, which may also be contributing to your current problem:
Attachment 129596

- you've got your Custom Image setting for both contrast and sharpness set pretty high to Hard, which may accentuate the appearance of 'noise';

- time to update your firmware from v1.02 to v1.03. Always a good step.
thanks for the tip about the contrast and sharpness setting. I will try resetting that. And are you sure the picture you posted is a smudge? It looks like a lint thread like particle to me. That has been there for some time, I have tried the sensor shake, and also a blower, but that one seems stuck on there.
05-25-2012, 11:11 PM   #7
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I don't really see noise; I see JPEG "banding" artifacts, which are quite normal when shooting large areas of flat color in JPEG mode.
05-26-2012, 01:24 AM   #8
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QuoteOriginally posted by Marc Sabatella Quote
I don't really see noise; I see JPEG "banding" artifacts, which are quite normal when shooting large areas of flat color in JPEG mode.
+1 on this.

05-26-2012, 06:03 PM   #9
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so i shot in raw, and converted to jpeg. There seems to be less noise now. thanks for the tip.
05-26-2012, 11:17 PM   #10
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It is not noise, it's JPEG 'artifacts' that come up due to compression. Use the most high-quality output setting available to avoid this, although your files will be larger. Your pick.
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