Nikon D70 firmware update and median filter

Discussion in 'Nikon' started by T.N.T., Jan 20, 2005.

  1. T.N.T.

    T.N.T. Guest

    Hi,

    Anybody knows if the newest firmware for the D70 has fix the "median
    filter" and (fake) RAW problem? Also is this "median filter" applied to
    shorter exposed images?

    http://astrosurf.com/buil/d70v10d/eval.htm
     
    T.N.T., Jan 20, 2005
    #1
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  2. T.N.T.

    Owamanga Guest

    No troll, the D70 firmware fixes are explained quite well on the Nikon
    site where you download it. Given that these behaviors were put there
    by design, I don't see why you expect them to be removed in a firmware
    release. The D70 *wasn't* built for astronomy.

    Your best bet, if photographing far-away dots is your habit, is to
    wait for a hacked firmware that may offer these features to meet your
    fairly specialist requirements.
     
    Owamanga, Jan 20, 2005
    #2
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  3. T.N.T.

    paul Guest


    So that 'median filter' searches out what looks like hot pixels & kills
    detail in the process? Shouldn't hot pixels be mapped out manually? That
    does look a lot less blurry. There is also an antialiasing/moire
    reducing filter, is that what the 'median filter' does?

    I might guess it doesn't matter at higher speeds but don't know. The
    article says if you turn on noise reduction for a D70 then cut the power
    before the dark frame is saved, that also stops both the dark frame
    subtraction noise reduction and the median filter for hot pixels (and
    antialiasing?).

    Not sure if I have that right.
     
    paul, Jan 20, 2005
    #3
  4. T.N.T.

    T.N.T. Guest

    It's a hidden (and IMO flawed) design and it's reasonably to expect
    hidden feature in a firmware update.
    No astronomy for me, but 1s or longer exposures are often used in low
    light photography, especially the colorful lightings in the upcoming
    Winterlude locally. And it's not just "far-away dots" that are affected
    by that "unique" feature. It's actually light, details and resolutions
    that are reduced. One can reasonably expect to have complete control and
    have nothing removed from a RAW file (without a cumbersome work-arround).

    And can you answer my sencond question?
     
    T.N.T., Jan 20, 2005
    #4
  5. T.N.T.

    T.N.T. Guest

    The AA filter is an optical low-pass filter installed in front of the
    CCD sensor. This so-called "median filter" appears to be some kind of
    software algorithm or some Nikon magic that is automatically applied to
    the RAW files. It seems to effectively removed all the hot pixels
    already (as well as light and details). Why then have the dark frame NR
    feature? It's kinda nuts.

    That's the main question.
     
    T.N.T., Jan 20, 2005
    #5
  6. T.N.T.

    T.N.T. Guest

    Another question, what purpose does this design aim to achieve compared and
    in addition to the dark frame NR?
     
    T.N.T., Jan 20, 2005
    #6
  7. T.N.T.

    Owamanga Guest

    Hidden - as in, not mentioned in the manual?

    Okay, another hidden feature is the counterweight they use on the
    mirror. Both features improve the cameras performance without being
    obvious. I guess they don't want their competition to be immediately
    aware of everything last thing that goes into making a Nikon a Nikon.

    Too late now of course. (well, it was too late the day they shipped
    the first unit).

    If this did appear in future firmware updates, I doubt it would be
    hidden - why bother adding functionality and then have to do more work
    to hide it.

    But now I see why you asked the question - you expected it to be a
    secret addition to the firmware, which would not be mentioned in the
    release notes. Apologies for calling you a troll.
    I see.

    But what exactly is cumbersome about rotating a small switch on the
    top of the camera? Is it that with long exposures you don't get any
    warning about the exposure ending ?

    (It does click and a bright green light comes on)
    Nope, but if it worries you, why not repeat a modified version of the
    long exposure tests that the astronomy walla did, and you'll be able
    to see for yourself. Severely underexpose a scene with bright
    pinlights by using a fast shutter speed. Do the switch-off trick and
    compare the RAWs.
     
    Owamanga, Jan 20, 2005
    #7
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