Rear/Second Curtain Sync

Discussion in 'Photography Equipment & Products' started by The Phototron, Oct 17, 2007.

  1. The Phototron

    The Phototron TPF Noob!

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    Okay, I have some potentially stupid questions.

    First, is rear curtain sync possible if the camera (Rebel XT) has this custom function? Or is it only possible if the flash (Vivitar 285HV) also has it?

    That is my situation, and so far I don't think it's possible to do rear curtain sync with vivitar 285HV on my Rebel XT. I read the manual, but it's not telling much.

    So here's the follow up questions:
    Is rear curtain sync only possible with Canon flashes on my rebel xt?

    Also is it possible with strobes like dyna-lite, and calumet's travelite?
     
  2. Big Mike

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

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    Good question :scratch:
     
  3. Big Mike

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

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    From the 'EOS Flash Bible'

     
  4. The Phototron

    The Phototron TPF Noob!

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    Thanks VERY MUCH Mike, though it doesn't comfort me very much that I have to get another Flash just for rear curtain sync. :/
     
  5. Big Mike

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

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    Ya, that's too bad...I would think it would be easy to just make the flash fire are the end of the exposure.

    You could probably try a few tests, just o confirm this. Set a shutter speed of a second or more and set the camera to 2nd curtain, then put your Vivitar on and shoot away.
     
  6. The Phototron

    The Phototron TPF Noob!

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    Yeah I did test it, I was just so desperate that it didn't work, so I came here to confirm it.

    But you are right, it shouldn't be too hard to activate it manually in the end of a long exposure with the test button.

    Edit: It's actually almost impossible! Panning and firing the flash manually at the same time.
     
  7. Big Mike

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

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    Oh, I guess you could try that.

    I was thinking that is shouldn't be too hard for Canon Engineers to make it fire at the end of an exposure...it's just an electrical signal to fire the flash.

    Although, thinking about it. If it's an off-brand flash, the camera wouldn't exactly know how long the flash burst is going to be...it would be hard to time it at the end of the exposure.
     
  8. The Phototron

    The Phototron TPF Noob!

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    That makes more sense, although it makes me sound like an idiot. :D
     
  9. Garbz

    Garbz No longer a newbie, moving up!

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    More importantly how would this work with TTL metering? The flash needs to metre first and then expose significantly later. I'm sure it all sounds easy if you have the datasheet infront of you. Would suck if you didn't.

    Maybe canon also simply withhold this information from competitors to increase sales of it's own speedlights.
     
  10. Big Mike

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

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    You can still use TTL metering and 2nd curtain sync (with a Canon flash). The pre flash fires before the exposure as usual...but then the actual flash doesn't fire until the end of the exposure....so the longer your exposure, the longer the delay. This can be troublesome when shooting people because they might move or blink after the first flash. Of course, if the scene changed between the metering and the flash...the exposure may not be accurate.

    Sounds like something they would do.
     

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