You can with a Nikon, not with a Canon ;-))

Discussion in 'Nikon' started by Sosumi, Sep 12, 2007.

  1. Sosumi

    Sosumi Guest

    Hack the flash so you synch at 1/4000 !!!
    I did it with the D40. Normal synch is already good at 1/500, but I want the
    camera to do what I want, not what he wants. So yesterday I got my new SB
    800 flash, very nice and fantastic features, like max. distance of over 50
    meters!
    Everything automatic, even the zoom up to 105 mm works together with the
    lens and if the camera goes standby or you turn it of, so does the flash.

    I had just finished the book (125 pages) and tried everything out. OK it
    works as a slave and everything you can want in a flash: it has got it!
    But I stay bothered by the max flash synch at 1/500. Why the heck is that? I
    remember when I had the D80, it flashed at any speed I choose, with the
    internal flash.
    So I found something on the net: tape all contacts of the camera or flash
    with paper or tape, except the middle one.

    That´s all. The camera thinks it has no flash and all automatic stuff is
    gone, but the flash DOES fire!! So I was able to FREEZE falling water from
    the tap in the kitchen. Very cool!!

    You just have to play with the aperture and the amount of flash a little.
    But it´s digital, so you can fool around as much as necesary.

    I did read most Canon camera´s can´t do this trick. Except maybe the older
    ones or more/most expensive. But lemme know if it´s not true!
    Also: show some pictures with what you can freeze here.
     
    Sosumi, Sep 12, 2007
    #1
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  2. Sosumi

    Rich Guest

    You mean like this? Done at 1/4000th of a second with flash by a
    P&S, the Olympus C-8080
    DSLR LUDDITES would not understand this.

    http://www.pbase.com/andersonrm/image/52119776
     
    Rich, Sep 12, 2007
    #2
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  3. Sosumi

    /dev/null Guest

    Well that is a load of BULLSHIT!!! The flash synch speed is the maximum
    shutter speed that doesn't cause the shutter curtains to be fully open. Any
    faster than the design synch speed will cause a shutter shadow on the image.
    What you are seeing is the flash duration, not synch speed. I can do the
    same effect on bulb. The shortest duration of the SB-800 is 1/41600 sec,
    that can freeze pretty much anything.
     
    /dev/null, Sep 12, 2007
    #3
  4. Sosumi

    Annika1980 Guest

    Hi-speed synch says hi.

    http://www.pbase.com/bret/image/26416596
     
    Annika1980, Sep 12, 2007
    #4
  5. Unless, the camera has an electronic shutter in addition to the mechanical
    one...
     
    Philip Homburg, Sep 12, 2007
    #5
  6. Sosumi

    Matt Ion Guest

    Any camera with hotshoe will do that with any hotshoe flash.
    No shit, Sherlock! Check out any non-dedicated generic flash and any
    older camera that doesn't support dedicated flash - ALL they use is the
    center contact! Wow!
    Neat, you've just re-discovered one of the first things ever done with
    the invention of the camera flash.
    Pick up a cheap non-dedicated flash... they have this little chart on
    the back that tells you what aperture to use at what distance for any
    given ISO speed. Wow, you're right on top of things with this radical
    new technique!
    You read wrong.

    Just shot this with my 300D and 420EX flash. No contacts taped up,
    flash set to high-speed sync, camera set to 1/4000, f/11, ISO200.

    http://www2.moltenimage.com/photos/1-4000_flash.jpg

    Exif Sub IFD

    * Exposure Time (1 / Shutter Speed) = 1/4000 second = 0.00025 second
    * Lens F-Number/F-Stop = 11/1 = F11.00
    * ISO Speed Ratings = 200
    * Exif Version = 0221
    * Original Date/Time = 2007:09:12 09:13:35
    * Digitization Date/Time = 2007:09:12 09:13:35
     
    Matt Ion, Sep 12, 2007
    #6
  7. Sosumi

    Sosumi Guest

    Unsharp, outta focus and too dark. What else, genius?
    You quote and read wrong: I wrote "except for the older ones" What do you
    call a 300D? New model? Practically a dinosaur.
    Try it with a "modern" Canon like the D400.
     
    Sosumi, Sep 12, 2007
    #7
  8. Sosumi

    Sosumi Guest

    Exactly: the manual reads: combined mechanical and electronical CCD shutter.

    So the bullshitter kan apologize ;-)))

    Even at 1/4000 I have no shadow of a doubt..
     
    Sosumi, Sep 12, 2007
    #8
  9. Sosumi

    Sosumi Guest

    According to your nick: dev or deaf? Null in many languages means zero or
    nothing. So you´re a deaf nothing, right?
    Read some books, dipstick..
     
    Sosumi, Sep 12, 2007
    #9
  10. Sosumi

    Paul Furman Guest

    The advantage of high speed synch is fill flash is bright sun, not
    freezing objects with only flash lighting. The SB800 should be able to
    do this by emitting a series of flashes in high synch mode.
    http://www.rpphoto.com/howto/view.asp?articleID=1026
     
    Paul Furman, Sep 12, 2007
    #10
  11. Sosumi

    Gino Guest

    I guess that you haven't heard of fp or high speed sync?

    Would be interesting to know the hit rate using your method. My guess is
    that it's not too reliable.
     
    Gino, Sep 12, 2007
    #11
  12. Sosumi

    Sosumi Guest

    My D80 HAD FP, but the problem is, the D40 doesn´t. Don´t understand hit
    rate. I get good pictures, if that´s what you´re worried about...
     
    Sosumi, Sep 12, 2007
    #12
  13. Sosumi

    Wayne Guest


    The obvious question is why would you want to set the shutter speed to 1/4000
    second for this? A totally unnecessary complication.

    Flash exposure is only about aperture and flash power. NOT about shutter
    speed. You only want the shutter to be open for flash. The only time you
    would care about exact shutter speed is for ambient lighting, if somehow mixed
    in the same frame (like outdoors in daylight - then matching the two
    exposures is necessary). At any one given aperture and ISO, then shutter
    speed controls ambient exposure, and flash power controls flash exposure.
    This is simply how things work.

    With regard to freezing your falling water, try this:

    Set lens aperture to maybe f/16 (for depth, am assuming up close)

    Set shutter speed to Bulb, where it stays open as long as you hold the button
    down (a couple of seconds). Set ISO 200.

    Set SB-800 flash to Manual, at lowest 1/128 power level (for fastest speed),
    at perhaps 8 inches (20 cm) from water subject (assuming flash zoom setting
    is at 24mm). Vary this ballpark distance in or out, as needed for proper
    exposure.

    Open shutter (hold button down in Bulb)

    Start the water drop moving, or whatever.

    Fire SB-800 flash in manual from maybe 8 inches (for water drops)
    (assuming it is timed to be at the right instant desired as subject).

    Then we are done, so close shutter by letting go of shutter button to shut it.
    Shutter was open maybe 1 or 2 seconds (shutter speed), but the water drop is
    perfectly frozen by the flash speed.. Which duration is 1/41,400 second for
    Nikon SB-800 at 1/128 power.

    The 1/41,400 second flash is much faster than the 1/4000 second shutter, and
    the shutter has no effect at all (so long as it was open). Even when the
    shutter speed was two seconds, it still has no effect at all (in this case).

    The 1/41,4000 second flash duration stops the motion. Not the shutter.
    Indoors in a halfway dim room, the ambient will not register in a couple of
    seconds.

    Theoretically, you might choose to use a tremendously slow flash unit with a
    fast enough shutter speed to matter, but why would you possibly want to?

    See http://www.scantips.com/speed.html about why speed lights are called speed
    lights, and regarding stopping motion with flash.
     
    Wayne, Sep 12, 2007
    #13
  14. 100 good out of 100 ?
    50 good out of 100 ?
    20 good out of 100 ?

    Hit rate..


    Anyway, Supporting what Wayne said elsewhere.

    http://www.evil-photographer.com/water.jpg

    Very quick & dirty test..

    Canon 350D. 1 sec at F8 in darkness.
    Canon 580EX.

    T.
     
    Tony Gartshore, Sep 12, 2007
    #14
  15. Sosumi

    Matt Ion Guest

    You didn't ask for focus or exposure, you asked for flash sync at
    1/4000s. Any other comments, idiot?
    A four-year-old camera is "a dinosaur"? Wow... then what would my
    1956-vintage Argus C-3 be? The 400D (not D400) is the younger brother to
    the 300D. Seeing as it's essentially a newer version of the same
    camera, and can use the same 420EX flash, how would it be any different
    in this regard?
     
    Matt Ion, Sep 13, 2007
    #15
  16. Sosumi

    mirafiori Guest

    it's not the camera does the trick but the flash. any flash with very short
    duration including your SB 800 could do the trick working with a canon
    camera or any camera. of course you need the understanding of how to trigger
    the flash on.
     
    mirafiori, Sep 13, 2007
    #16
  17. Sosumi

    Ricco Guest


    Vous parlez de quoi ?
    je ne voudrais pas déranger.
     
    Ricco, Sep 13, 2007
    #17
  18. Sosumi

    Ghost-Rider Guest

    To all our Australian friends: please note that fr.rec.photo is a
    French-speaking newsgroup.
    Please either discard its address from your adress list or translate all
    the above discussions into the French language, as you may choose. ;-)

    Thank You and kind regards.

    Ghost Rider
     
    Ghost-Rider, Sep 13, 2007
    #18
  19. Sosumi

    Sosumi Guest

    I think it´s a great idea!
    Thanks, I´m going to try it!
     
    Sosumi, Sep 13, 2007
    #19
  20. Sosumi

    Jerome jj Guest

    C'est fou comme l'anglais ressemble à du spam !

    :)
     
    Jerome jj, Sep 13, 2007
    #20
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