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  1. #1
    baachitraka's Avatar
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    Confusion regarding High speed sync and FP flash

    Hello there,

    What is the difference between High speed sync(Speed lite) and FP flash(Old Olympus)? If high speed sync is something which fires continuous pulses, can I use this on Olmypus OM-1 cameras with higher shutter speed?
    OM-1n: Do I need to own a Leica?
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  2. #2

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    The OM-1, OM-1 MD, OM-1N, OM-2 and OM-2N all have focal plane shutters as well as a PC type flash sync socket. As you are looking at the front of the camera, the PC socket is on the right hand side of the lens mount at the same level as the carry strap lug. As part of the PC socket, there is a switch labeled "X" (in blue) and "FP" (in black). You will notice that the shutter speeds 1 second through 1/60th second on the shutter speed dial are in blue and the speeds 1/125th second through 1/1000th second are in black.

    The shutter is composed of two separate curtains. The film is exposed to light by the first curtain moving out of the way of the film gate and then the second curtain moving to cover the film gate up to complete the cycle. When you advance the film, the shutter is reset to the original configuration. The shutter curtains are small and light, but they still have some mass and they still must travel about 1.5 cm. The travel takes time. To get a shutter speed faster than 1/60th second, the first curtain will start moving and before it completes it's travel, the second curtain starts to move. The result is an open slit that moves across the film gate. So at shutter speeds 1/125th through 1/1000th second, the whole frame is not exposed at he same instant.

    Now we know how the shutter works and we can consider the problem of synchronizing the shutter with a flash system. Electronic flash has some desirable qualities. Color temperature is the same as daylight. The "flash" is extremely bright, but extremely short in duration. The problem with higher shutter speeds is that the Flash of electronic flash is so short that the slit moving across the shutter will only expose a small area of film (less than the whole frame) before the "Flash" is over.

    In the 1970's and earlier times flashbulbs were available to photographers. There were several different types of flashbulbs including type F (fast peak), type M (medium peak) and type FP (focal plane). Flash bulbs are simply a glass bulb filled with oxygen and a metal mesh that burns and produces heat and light. Type FP flash bulbs were made to burn for a long enough time that they can be used with cameras that use a focal plane shutter. For example, Sylvania FP26 flash bulbs can be used to synchronize with any shutter speed of your OM-1 up to 1/1000th second.

    If you have an electronic flash with a PC cord connection, plug the cord into the PC socket of the camera. Set the PC synch switch to "X" (in blue) and use any of the blue shutter speeds on the camera (1 second through 1/60th second. You can also use type "M" or type "F" flash bulbs with the "X" setting provide you use 1/15th second or slower. You can use type FP flashbulbs at any shutter speed.

    It is interesting to note that Olympus developed the OM-4T and the F280 electronic flash to mimic the focal plane flash system. the F280 flash uses a series of flash pulses to get a long duration burst of light.
    Last edited by mopar_guy; 02-28-2012 at 10:09 AM. Click to view previous post history.
    Dave

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    She's always out the window, When it comes to making Dreams.

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    From It's All Mixed Up by The Cars

  3. #3
    baachitraka's Avatar
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    Still some more ignorance to clear.

    If I use any modern speedlite in manual mode e.g., 430 EX with full power and high speed sync turned on. Now, I shoot at 1/60 and at 1/125 what will happen?

    I presume the flash gun may need additional instructions from the camera to shoot continuous pluses.
    OM-1n: Do I need to own a Leica?
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    Holga 120GFN: Amazingly simple yet it produces outstanding negatives to print.

  4. #4

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    The hot shoe of the OM-1N will synchronize for electronic flash and the setting of the PC socket switch make no difference. The FP setting of the PC socket switch includes a short built-in delay to allow the Focal Plane flashbulb to "ignite". You could try some experiments with the flash mounted in the hot shoe. I believe that the Olympus system (Super FP mode of the F280) is set up that the flash starts firing as soon as the first curtain starts moving. I also think that the OM-1 is synchronized to fire the flash when the first curtain is fully open.
    Dave

    "She's always out making pictures, She's always out making scenes.
    She's always out the window, When it comes to making Dreams.

    It's all mixed up, It's all mixed up, It's all mixed up."

    From It's All Mixed Up by The Cars

  5. #5
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    ^Im doubting your Canon flash will work in HSS mode on an Olympus.

    The Canon flash uses proprietary signals from the camera body in HSS mode. I'm pretty sure it needs a canon body to talk back and forth.

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    Quote Originally Posted by brucemuir View Post
    ^Im doubting your Canon flash will work in HSS mode on an Olympus.

    The Canon flash uses proprietary signals from the camera body in HSS mode. I'm pretty sure it needs a canon body to talk back and forth.
    I argee.
    Dave

    "She's always out making pictures, She's always out making scenes.
    She's always out the window, When it comes to making Dreams.

    It's all mixed up, It's all mixed up, It's all mixed up."

    From It's All Mixed Up by The Cars

  7. #7

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    ANY of the more traditional SLR's OM1,2, Nikon F,2,3 Canon FT,FTb,F1,AE, A1, AV etc fire the flash when the first curtain fully opens the film gate.
    The reason you may have a partial picture is that at higher then sync speed the shutter becomes a traveling slit and the Gate is partially covered when the flash triggers.
    The cameras with electronic controls have the flash repeat at a very high rate so the ggate is covered by repeating exposures.
    Heavily sedated for your protection.

  8. #8
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    The concept of higher shutter speeds of Canon dSLR while using the 580EXII is quite similar to Olympus F280 flash with Olympus body...in both units, the short single pulse electronic flash is changed so that there is a series of rapid lower power pulses which appears to be 'one long duration flash' but which is simply a very rapid series of pulses. The implementation is likely to be different, so not directly compatible with one another.

    As stated earlier, the FP setting of the PC socket switch factors in a short built-in delay to allow the FP flashbulb to ignite and achieve full output of light, before the shutter curtains move across the film plane.

  9. #9
    baachitraka's Avatar
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    It would be cool to have a flash with high speed sync button + manual shutter speed slider that may start from (1/125...1/1000) or more.
    OM-1n: Do I need to own a Leica?
    Rolleicord Va: Humble.
    Holga 120GFN: Amazingly simple yet it produces outstanding negatives to print.

  10. #10
    Newt_on_Swings's Avatar
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    The Canon flash will not sync with the Oly shutter. The High speed sync needs canon's ttl2 mode to operate, and therefore needs a ttl2 body.

    The Olympus T models and one of the odd om77 can use the f280 at any shutter speed. I have it and it is a very nice combo with the om4t, a marvel at its time.

    Distance for it is very short though.

    I assume a way to cheat around this would to maybe use the modeling light on your canon flash to get this effect. The speedlight modeling lamps do something very similar to flicker the flash at a lower power setting to get a continuous light source. or just get the f280 if you have a om3t or om4t its a very good buy.

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