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Question about noise
I've just bought a EOS Digital Rebel XT with the lens kit (EF 18-55/F.3,5-5,6). I think it's good to start with. Today I took a picture on a simple tree with a clear blue sky as background. And the blue color tend to be a little bit noisy. I used ISO 100 and the pic was right exposured...

Comments (7)

I think any noise in the image would be generated by the camera rather than the lens. However, it is possible that noise could be introduced later on your PC screen or when the picture is printed. if the same noise appears on the screen and on a print then it is likely to be camera noise. If so, cleaning the sensor ought to fix it...

Comment #1

Thanks for replying, can noise appears with a dusty lens or the mirror in front of the sensor?..

Comment #2

It would help to se the image. "Noise" should be consistent across the image, showing up in a solid blue sky because it's easiest to see agains the single color. But that would be unusual in an iso 100 shot unless looked at very, very closely. If it's spotty, like little blurs in discrete spots, then that could be from a dirty sensor. Contamination on the mirror won't show in the picture. A dirty lens is hard to see unless there are major spots, like drops of water, etc...

Comment #3

Here is the picture I took. Observe the left upper corner. Is there any noise or is it just me looking too carefully?Please reply comments on the noise, explination. Attachments:.

_MG_0286.JPG..

Comment #4

I'm not sure if that's noise, not like you'd see with a small sensor at high iso's by any means, keeping in mind that's me with my glasses and monitor looking at it. I do think there's a dust spot down to the lower right. The sky is pretty dark and there is some underexposure noise with dslrs so it may be a little symptomatic of that. Maybe more an issue of looking too closely. Keep in mind that with the reduced resolution of a screen image, you may see things that wouldn't be apparent in a print...

Comment #5

So...you think it would helped if the sky were moore uplighted?..

Comment #6

I think it's maybe a little underexposed but there is some room left before the whites get overexposed...

Comment #7

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