Med. format CCDs a cut above DSLR sensors?

Discussion in 'Digital SLR' started by Rich, Nov 24, 2005.

  1. Rich

    Rich Guest

    Dalsa is supplying these to one or two companies, whose cameras run
    around $30,000/ea. Is part of this due to the fact the Dalsa CCDs are
    a higher grade (fewer dead pixels, more uniform pixel response) than
    the CCD/CMOS sensors used in DSLRs? Even the Canon 1DSMk2 is
    inexpensive compared to some of the medium format backs.
    -Rich
     
    Rich, Nov 24, 2005
    #1
    1. Advertisements

  2. Don't think so. Mostly just bigger sensors. Data is captured at higher
    bitrates too- 16 bit RAW, making for 60Mb+ uncompressed files, IIRC.

    Max ISO is 200, frame rate is spf rather than fps, and they work tethered to
    an Image Tank or with CF type IIs. These are NOT 35mm or DX format DSLR
    replacements!

    Oh, and the use of a digital back on a medium format SLR makes the camera a
    DSLR- the distinction you make in the subject line isn't there.

    Martin
     
    Martin Francis, Nov 24, 2005
    #2
    1. Advertisements

  3. Rich

    tomm101 Guest

    Two reasons they are so expensive, the size, and the difference between
    industrial grade chips and comsumer grade chips. Chip manufacturers
    have learned how to make APS size chip in consumer grade, so we have
    the D70 and the Digital Rebels, very good cameras but not great. I use
    an industrial grade 6mp chip on a retina camera I use(made by
    Megavision) it is much better than the standard 6mp chips in 35mm style
    cameras, it also costs $15K. I'm afraid these Dalsa chips will make
    images we can't touch with "cheap $2K" cameras. We will just have to
    see how this plays out. The world can only support so many $5K a day
    photographers.

    Tom
     
    tomm101, Nov 24, 2005
    #3
  4. You just now finding this out? Must not get out very much.


    *********************************************************

    "I have been a witness, and these pictures are
    my testimony. The events I have recorded should
    not be forgotten and must not be repeated."

    -James Nachtwey-
    http://www.jamesnachtwey.com/
     
    John A. Stovall, Nov 25, 2005
    #4
  5. *********************************************************

    "I have been a witness, and these pictures are
    my testimony. The events I have recorded should
    not be forgotten and must not be repeated."

    -James Nachtwey-
    http://www.jamesnachtwey.com/
     
    John A. Stovall, Nov 25, 2005
    #5
  6. The mouse is quicker than the fingers. The 'blad H1 has a built in
    40Gig hard drive and it's raws run a 162megs.


    *********************************************************

    "I have been a witness, and these pictures are
    my testimony. The events I have recorded should
    not be forgotten and must not be repeated."

    -James Nachtwey-
    http://www.jamesnachtwey.com/
     
    John A. Stovall, Nov 25, 2005
    #6
  7. Rich

    Rich Guest

    I wanted to avoid confusion. When people think "beyond 35mm size"
    they think medium format.
    -Rich
     
    Rich, Nov 25, 2005
    #7
  8. Rich

    Rich Guest

    I knew there were 3 basic CCD grades; Consumer, Industrial and
    medical. But I have no idea how they grade CMOS or exactly which
    grades they used in various cameras. But, I did know that DALSA
    more or less specialized in higher grade CCDs. You don't see them
    putting Canon or Sony sensors on space probes.
    -Rich
     
    Rich, Nov 25, 2005
    #8
  9. Rich

    JPS Guest

    In message <dm5ii2$lq5$>,
    Which, of course, means 12-bit ISO 3200, something most DSLRs don't even
    have (most have 11-bit ISO 3200).
    --
     
    JPS, Nov 25, 2005
    #9
  10. Rich

    george Guest

    And economies of scale as well...many of the consumer sensors are shipping
    at rates of 100,000 per month while, I'd bet, most of the industrial sensors
    are more likely in the 100-1,000 range. Usually, the difference between
    industrial and consumer chips is ceramic vs. plastic packages...when you go
    to military chips, the differences are temperatures of operation and
    sometimes radiation hardening.

    George
     
    george, Nov 26, 2005
    #10
  11. Rich

    Rich Guest

    That too. The set-up costs alone for a production run must be
    massive. The lenses used to create the circuit patterns alone run
    $700k-over a million $'s a piece, and Canon makes some of them. They
    wear out as well, owing to the beam composition so they have a finite
    life that has to be factored into the cost of making the ICs.
    -Rich
     
    Rich, Nov 26, 2005
    #11
    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.