pixels / pixel size / sensor size

Discussion in 'Digital Cameras' started by stu7, Apr 25, 2012.

  1. stu7

    stu7 Guest

    Ive been looking at pixels / pixel size / sensor size

    pixels are something every inexpensive digital camera
    seems to have a lot of.

    Next I see sensor size... so, question #1 is - how do
    these two relate ? Does sensor size necessarilly equate
    to larger pixels... couldnt the manufacturer just fill
    a larger sensor with cheap old small pixels ? : -)

    After reading some more, I decided the whole problem can
    be fixed with a simple trick... get one of the el-cheapo
    10 megapixel or greater P&S cameras... pump up the dpi to
    600 or 1200 dpi, and, youve got an image with four times
    the pixel size, yes ?

    I havent had time to test this yet... hopefully somebody
    will know if it could work.

    thanks for reading
    stu7, Apr 25, 2012
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  2. Well, they're not cheaper or more expensive particularly, but yes, you
    can put a wide range of pixel counts on a given sensor size; the Nikon
    D700 puts 12 megapixels on a full-frame sensor, the D800 puts 36
    megapixels there.

    The sizes used on cell-phone cameras are, in practice, not used in
    full-frame DSLRs, though.
    No. DPI is a meaningless attribue of a digital image (it will influence
    default size for image placement in page layout programs, but that's
    about it).

    There ain't no such thing as a free lunch!
    David Dyer-Bennet, Apr 25, 2012
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  3. stu7

    bugbear Guest

    It should reflect the size of the sensor, so I wouldn't say it's meaningless.

    It's not of much practical use though.

    bugbear, Apr 26, 2012
  4. Of the sensor? No. Nothing I know uses it that way.
    I certainly agree there.
    David Dyer-Bennet, Apr 26, 2012
  5. stu7

    stu7 Guest

    *** to which BugBear responded ***
    First, let me thank David for the info about different
    pixel arrangements on full size sensors... thats so
    Now, rather than disagree about my second inquiry,
    regarding PPI... this is a bit funny really... David
    answered this correctly in my view... as did BugBear
    in his response, though there seems to be disagreement
    between them(!)... so perhaps I should clarify, that
    I had not imagined any quality of pixels-per-inch
    /but that/ it provided a means to visually condense
    more pixels into a smaller space, thus [approximating
    the effect] of larger pixels on larger sensors... or...
    squeezing more small pixels into the same space as
    fewer larger pixels occupy, is the best I can say it.

    Really, what I was looking for, and didnt ask about
    specifically, was for some kind of technical / qualitative
    definition of this effect... again... how many smaller
    weaker pixels grouped together might equal how many
    larger stronger pixels ?
    There are other qualities associable with pixel power...
    Ive seen the matter mentioned here a few times... basically,
    as regards how luminosity is recorded... pixel sensitivity
    maybe ?

    + +
    stu7, Apr 26, 2012
  6. That depends on the pixel size of each and what you define as
    Full well size?

    Wolfgang Weisselberg, Apr 30, 2012
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