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  1. #1
    Join Date
    Jul 2005
    Posts
    51

    megapixels vs ISO

    Is it true that the lower the megapixels your camera has that when you use a higher ISO you are likely to get less noise?

  2. #2
    Join Date
    Jul 2004
    Location
    Los Altos, CA
    Posts
    2,635

    Red face No direct correlation there...

    Quote Originally Posted by ken212 View Post
    Is it true that the lower the megapixels your camera has that when you use a higher ISO you are likely to get less noise?
    The most important thing controlling noise is the size of the sensors in the camera. So DSLRs with much larger sensors than little Point & Shoot compacts can shoot the ISO way up, irrespective of how many megapixels they happen to have. Also, sensors using CMOS technology are cleaner than sensors using CCD technology, so that's a factor too.

    And if you take a camera that has, say, 10 megapixels, and select a lower-sized 3 megapixel option, you might think you'd have less noise, but not necessarily true, since the sensors in the resulting 3 megapixel "crop" are no larger than those in the full 10 megapixel sensor array.

    If you're trying to compare two cameras or more, what are the cameras?
    Last edited by John_Reed; 06-19-2007 at 04:45 PM.
    Let a be your umbrella!

  3. #3
    Join Date
    Oct 2006
    Location
    San Francisco
    Posts
    2,251
    Sort of. In general, for a sensor of the same size, after a certain point, the more megapixels the lower the image quality. However, there are too many variables to simply say, "more megapixels equals worse high ISO performance." A larger sensor can fit more megapixels while maintaining image quality. That's why DSLRs can have better image quality than point & shoots, and why full frame DSLRs can have better quality than smaller frame DSLRs. Also, the technology behind a particular sensor, the camera's software, and other variables can make a huge difference.
    Last edited by AdamW; 06-19-2007 at 04:47 PM.
    Adam
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