camera noise explained
High ISO without noise?
Hi there, I realized that in photography, when you are using a DSLR and pump up your ISO, if can get noisy at times.
But however, there are also times when I pump a 350D camera to it’s maximum at 1600, it doesn’t produce any visible noise in the photo at all.
Can someone explain the rational behind, what actually causes noise to occur and how can we avoid it when using high ISO??
You can see some noise level tests on this page. Look at the samples AND the graphs below the samples:
http://www.dpreview.com/reviews/canoneos400d/page17.asp
Although the CMOS sensors are supposed to be superior at handling noise at high ISO’s, I also think your camera has a noise reduction feature that kicks in at ISO 800. If you look at this page, you can see how much they sacrifice sharpness to eliminate noise.
http://www.dpreview.com/reviews/canoneos400d/page18.asp
In other words, noise is more objectionable than a slight degree of unsharpness and Canon has chosen to cut out the noise at the expense of another image quality. It’s probably a good choice.
STS-124 Launch w/ Sound
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