there are 3-imager video cameras, are there 3-imager still cameras?

Discussion in 'Digital Photography' started by Bob Fleischer, Jan 29, 2010.

  1. If having three imagers is desirable for a better video camera, are
    there any three-imager still cameras? If not, why?

    Bob
     
    Bob Fleischer, Jan 29, 2010
    #1
    1. Advertisements

  2. Bob Fleischer

    Guest Guest

    keeping three chips perfectly aligned is *very* difficult and it would
    require a beam splitter which makes most lenses not work, there is
    three times as much data to move which means storage and cpu
    requirements triple, it's a lot more expensive and it doesn't offer
    much benefit.
     
    Guest, Jan 29, 2010
    #2
    1. Advertisements

  3. It's probably just too bulky and expensive considering the benefits.
    Low-light performance is not as important in still cameras as in video
    cameras, because the shutter speed isn't limited by the framerate.

    http://en.wikipedia.org/wiki/Three-CCD
     
    Robert Spanjaard, Jan 29, 2010
    #3
  4. Bob Fleischer

    Save $3.99 Guest

    Name one video camera that uses a Foveon sensor? Canon offers the XL-H1 with
    a 3-chip 1/3", approx. 1.67 megapixels per CCD, CCD.
     
    Save $3.99, Jan 29, 2010
    #4
  5. Bob Fleischer

    Bruce Guest


    Back in 2000, Hasselblad planned a medium format 16 MP DSLR with three
    separate Foveon-made CMOS sensors, one each for red, blue and green.
    It was to have been called the Hasselblad DFinity.

    http://everything2.com/title/Hasselblad+DFinity

    The project was never completed. Some prototypes were shown to a
    select few journalists, and that was it.

    Foveon went on to design and manufacture a three-layer sensor that is
    used in Sigma DSLRs and Sigma P&S digicams.
     
    Bruce, Jan 29, 2010
    #5
  6. Bob Fleischer

    Guest Guest

    here we go again. foveon does *not* capture rgb. it measures three
    overlapping ranges and calculates rgb from that. it has all sorts of
    problems, and at the end of the day, the output is worse than competing
    bayer cameras.
     
    Guest, Jan 29, 2010
    #6
  7. Bob Fleischer

    Guest Guest

    the sigma dp1 and dp2 do video. it's only 320 x 240 though.
     
    Guest, Jan 29, 2010
    #7
  8. Bob Fleischer

    Guest Guest

    it was on display at the photo plus expo in new york (with a *really*
    attractive model, but i digress).
     
    Guest, Jan 29, 2010
    #8
  9. Bob Fleischer

    Guest Guest

    it does not measure any components, it calculates them. if bayer
    'guesses' missing data (according to foveon fans), so does foveon. in
    fact, foveon guesses much more than bayer does (and is measurably less
    accurate).
    i have nothing against full colour sensors. what i have a problem with
    are the lies from sigma/foveon. some of the stuff they claim is
    physically impossible and even contradicts their own patents. deception
    doesn't even begin to describe it.
    only *if* they don't compromise other more important aspects, such as
    resolution, noise, dynamic range, etc.

    right now you have a choice between 4.7 megapixels on foveon or 18
    megapixels bayer (of similar crop factor). the image quality of the
    bayer sensor is so far ahead it's not even funny.

    if someone comes up with an 18 megapixel full colour sensor, then it
    might be worth a second look.
    maybe, but it won't be that soon. physics gets in the way and bayer is
    actually very good.
     
    Guest, Jan 30, 2010
    #9
  10. Bob Fleischer

    Guest Guest

    right, all those gorgeous images with lots of detail and accurate
    colours had me confused.
     
    Guest, Jan 30, 2010
    #10
  11. Bob Fleischer

    Guest Guest

    what loss? an 18 megapixel canon 7d has far more resolution than the
    4.7 megapixel foveon could dream about. even the most diehard foveon
    fans admit that.

    even the 12 and 15 megapixel slrs blow away what foveon can do and
    those cameras will probably be replaced with higher resolution sensors
    within the next few months (pma is in february).

    step up to a full frame slr and it's even worse. 21-24 megapixels,
    versus 4.7 and the price of full frame keeps getting lower with every
    generation.

    maybe one day there will be a full colour sensor that is as good or
    better than bayer, but as i said, it won't be very soon.
     
    Guest, Jan 31, 2010
    #11
  12. Yep, we did, and the 4.7 M pixel positions Foveon rivals a 6 or
    7 MPix classical bayer filter (RGGB or BGGR) sensor for resolution.
    As any Google search would show. As any Google search would
    show, there are plenty cameras with 8 or more MPix bayer sensors.
    As any Google search would show, Foveon has bad colour separation
    and no higher ISO qualities to speak of.

    Shall I go on reading you what you should have googled yourself?

    -Wolfgang
     
    Wolfgang Weisselberg, Feb 7, 2010
    #12
  13.  
    Wolfgang Weisselberg, Feb 7, 2010
    #13
  14. Bob Fleischer

    Paul Furman Guest

    Plus it would be huge with three APS sensors and perhaps even need
    special lenses with a longer flange distance.

    It seems they overcame the speed issue with video though that's pretty
    much solved for bayer FF 35mm now.
     
    Paul Furman, Feb 7, 2010
    #14
  15. Bob Fleischer

    Ray Fischer Guest

     
    Ray Fischer, Feb 7, 2010
    #15
    1. Advertisements

Ask a Question

Want to reply to this thread or ask your own question?

You'll need to choose a username for the site, which only take a couple of moments (here). After that, you can post your question and our members will help you out.