Shutter Speed (Technical)

Discussion in 'Photographic Discussions' started by prodigy2k7, Aug 7, 2008.

  1. prodigy2k7

    prodigy2k7 No longer a newbie, moving up!

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    So, lots of cameras have a fastest speed of lets say 1/4000 or 1/8000.

    Logically speaking, thats...pretty fast :\
    How long does it actually take for the shutter to fully open? Obviously it has to be fast enough so the whole picture is exposed right instead of one side being under exposed and the other side being properly exposed, right?
     
  2. Yahoozy

    Yahoozy TPF Noob!

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    well i think it takes about half the time to fully open and then half the time to fully close, but it could also mean that the shutter is completely open for, lets say 1/4000 of a second and the time it takes to open and close fully arent really counted
     
  3. Steph

    Steph No longer a newbie, moving up!

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    At those speeds the shutter is never fully opened. The second curtain starts travelling before the first as fully opened. The gap between the two curtains then travels across the frame to expose the picture evenly. And you don't need a very fast shutter speed for the shutter to work that way. Anything shorter than the flash sync speed (that's around 1/125s for many current cameras) will result in the shutter not opening fully.
     
    Last edited: Aug 7, 2008
  4. Bifurcator

    Bifurcator TPF Noob!

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    Right. I guess it's always been about that tho. By listening to 25 year old cameras the 1/125 sounds identical to 1/4000. There's a noticeable difference between the sound of 1/60 and 1/125 though - as well as all slower speeds. :D

    Electronic shutters can flash-sync much faster too. Mine syncs at 1/2000 :p. But ES are silent. :D
     
  5. Do'Urden's Eyes

    Do'Urden's Eyes TPF Noob!

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    1/2000 Bifurcator :| thats seriously your sync speed? What are you shooting? because i believe not even high end Canons sync at that speed. the 1DS MarkIII i think is only 1/250 flash sync. i know however that Nikon generally has faster sync speeds but 1/2000!

    Yeah so what are you using?
     
  6. Big Mike

    Big Mike I am Big, I am Mike Staff Member Supporting Member

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    Cameras that sync that fast don't use a traditional mechanical shutter. As mentioned, it's 'electronic'...meaning that the sensor is 'activated' for that short period of time.

    Also, old 'leaf' type shutters could flash sync at any of their speeds.
     
  7. Bifurcator

    Bifurcator TPF Noob!

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    Yup, right you are Mike. Actually I read somewhere that mine has both a mechanical and an electronic shutter but I dunno when or how it decides if it's mutually exclusive. I assume however, they are both always used and the ES opens before the MS and closes after it for long exposures (I dunno, less than 1/200?) and the opposite case for faster exposures.

    I'm not entirely sure but I think most bridge cameras will sync at any speed like that.

    Right you are about leaf (and curtain?) shutters also but sometimes they missed :D and the occasional odd shot on some cameras will come out black or gradated. hehehe...
     
  8. Sw1tchFX

    Sw1tchFX TPF Noob!

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    My D70 has a electronic shutter, where the actual mechanics only go up to 1/90th of a second, but the camera can shoot up to 1/8000th with a flash sync at 1/500th.
     
  9. MarcusM

    MarcusM TPF Noob!

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    Does anyone have a good link to a graphic image or flash movie depicting how a shutter opens/closes? I've always wondered.
     
  10. kundalini

    kundalini Been spending a lot of time on here!

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    Not sure of the actuation of the shutter, all I know is that at 1/8000s you can freeze a bumble bee's wings.
     
  11. MarcusM

    MarcusM TPF Noob!

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    hehe, wow, that's cool.

    Evolution was not kind to those suckers...look how tiny those wings are in comparison to their body, no wonder they have to flap those things so fast.

    [/end of thread hijack]
     
  12. Bifurcator

    Bifurcator TPF Noob!

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