Nikon D300 Camera Out performing the Metering System in both A and S Modes

Discussion in 'Nikon' started by LuvLatins, Dec 25, 2007.

  1. LuvLatins

    acl Guest

    It is a crop of the actual image, with no resizing; it's the actual
    pixels, I had 10 million like this before cropping (the d200 is 10
    megapixels!).
     
    acl, Dec 29, 2007
    #61
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  2. LuvLatins

    acl Guest

    here's the whole thing downsized, by the way
    http://www.pbase.com/al599/image/90920461
     
    acl, Dec 29, 2007
    #62
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  3. Provided your camera is attached to the tripod, because that changes
    the resonant frequencies, and provided you strike it in the same
    direction and rough location as the mirror slap impact would, because
    that selects the relevant resonant frequency, and provided it is
    within the range of human hearing.
    Which you wouldn't hear because it's beyond the range of human hearing.
     
    Chris Malcolm, Dec 30, 2007
    #63
  4. Ah, nothing in the comment or EXIF data of the image told me that. In
    that case I agree, that's as sharp as sharp can be :)
     
    Chris Malcolm, Dec 30, 2007
    #64
  5. Good point, since with current technology noise is probably a major
    contributor to the sensitivity floor.
    In some circles what distinguishes professionals from the rest is an
    arcane secret known to very few, and among those who know it, very few
    actually have the sheer guts required to actually do it. My life could
    be in danger if I mentioned it explicitly, but some of you may
    recognise this ancient acronym: RTFM.

    I'm getting the impression from some of the self-styled photographic
    professionals here that professional photography is not one of those
    areas of professional expertise. Perhaps professional photographers
    are distinguished by the simpler more modern criterion of doing it for
    money? It wouldn't be surprising if that were the case in those human
    societies in which money is regarded as the sine qua non of social and
    spiritual status, for example.
     
    Chris Malcolm, Dec 30, 2007
    #65
  6. Now that I've looked at that specific rather unspecific manual I'd
    have to agree :)
     
    Chris Malcolm, Dec 30, 2007
    #66
  7. LuvLatins

    acl Guest

    No.... I explained...
     
    acl, Dec 30, 2007
    #67
  8. That is the key statement, right there. Until the
    significance of that statement is understood, the
    effects of either tripod resonance or mirror lockup will
    not be understood.
    Regardless of the resonant frequency, if the burst of
    vibration lasts for less than some fraction of the
    shutter speed, it will have relatively no effect.

    Exactly what fraction of the shutter speed will be
    significant, is determined by the amplitude of the
    vibration.

    All this discussion of the resonant frequency misses the
    point that the frequency is irrelevant.
     
    Floyd L. Davidson, Dec 30, 2007
    #68
  9. LuvLatins

    acl Guest

    Well, I wrote later:

    What you want is for the damping rate of the oscillations at that
    particular frequency caused by mirror slap (say) to be large. Adding
    the bag damps all frequencies, hence also the resonant one.


    (actually, earlier I mistyped "the particular" instead of "that
    particular", ie resonant). Obviously, the mode that's most important
    is the one that lasts for longer; which one this is is a combination
    of damping rate and initial amplitude. The largest initial amplitude
    will be for the resonant mode; because for a short initial impulse,
    all frequencies get a "hit" at the beginning. So unless some mode has
    anomalously low damping, it's the resonant mode that'll survive for
    longer. Now there might be some result about resonant frequencies and
    their damping in mechanical systems that I don't know about. But if
    you just band on a tripod, you get a characteristic frequency;

    I hope that spelling out more clearly what I tried to say (above)
    helps.
    In fact by the damping rate. The magnitude of the blur is what depends
    on the amplitude.
    Hmmm... Maybe it's someone else who missed the point... But I suspect
    I'll now find out that I do not understand resonances. The wonders of
    rec.photo.digital.slr-systems!
     
    acl, Dec 30, 2007
    #69
  10. LuvLatins

    Paul Furman Guest

    Well we are all different. For me, the delay messes with my
    concentration for holding steady... maybe with practice...
     
    Paul Furman, Jan 2, 2008
    #70
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