firing the flash at the end of te exposure instead of the beggining...

Discussion in 'Beyond the Basics' started by nagoshua, Nov 12, 2007.

  1. nagoshua

    nagoshua TPF Noob!

    Joined:
    Mar 10, 2007
    Messages:
    149
    Likes Received:
    0
    Can others edit my Photos:
    Photos OK to edit
    I've lost the instruction manual to my 430ex flash, im going out to take some photo in town tonight of a friend so ill need a slow shutter for the background and some flash to expose him, question 1, when is it best to fire the flash in this situation? before or after? and question 2, how do i get my flash to fire at the end of the exposure (im guessing its a custom function on the flash or something).
     
  2. Big Mike

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

    Joined:
    Dec 16, 2003
    Messages:
    33,821
    Likes Received:
    1,811
    Location:
    Edmonton
    Can others edit my Photos:
    Photos NOT OK to edit
    IMO, it's almost always best to fire the flash at the end of the exposure...known as 2nd curtain or rear curtain sync. This way, any motion blur will show up behind the flashed exposure...and look more natural.

    That being said, if you use 2nd curtain sync...there will be a longer time between flashes. The camera/flash uses a pre-flash for metering...usually this is so fast that it's almost indistinguishable from that actual flash...but when you push the flash to the end of the exposure...the pre-flash still fires before the exposure. This may cause your subjects to think that the first flash is the real flash and turn away...or it may cause them to blink etc.

    I'm pretty sure you can set 2nd curtain sync on either the camera or the flash. I'm not sure which will be the overriding control...the camera I think.
    It's one of the custom functions in your camera's menu.
     
  3. Jeff Canes

    Jeff Canes No longer a newbie, moving up!

    Joined:
    May 19, 2003
    Messages:
    6,190
    Likes Received:
    22
    Location:
    Hollywood, FLA USA
    Can others edit my Photos:
    Photos OK to edit
    Did you check the Canon site to see if you can download the manual
     
  4. nagoshua

    nagoshua TPF Noob!

    Joined:
    Mar 10, 2007
    Messages:
    149
    Likes Received:
    0
    Can others edit my Photos:
    Photos OK to edit
    i thought it was that, i tried it and the flash still fired at the beggining, turns out i have to set it on both camera and flash, problem is, i dont know which custom function on the flash it is!!
     
  5. Big Mike

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

    Joined:
    Dec 16, 2003
    Messages:
    33,821
    Likes Received:
    1,811
    Location:
    Edmonton
    Can others edit my Photos:
    Photos NOT OK to edit
    From HERE
     
  6. nossie

    nossie TPF Noob!

    Joined:
    Oct 15, 2007
    Messages:
    794
    Likes Received:
    1
    Location:
    Dublin, Ireland
    Can others edit my Photos:
    Photos OK to edit
    Kudos to Big Mike for doing the research work.
     
  7. Big Mike

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

    Joined:
    Dec 16, 2003
    Messages:
    33,821
    Likes Received:
    1,811
    Location:
    Edmonton
    Can others edit my Photos:
    Photos NOT OK to edit
    That is from what is commonly referred to as 'The EOS Flash Bible'. It's a lot of reading, much of which is rather technical...but all the info is in there, somewhere.
     

Share This Page

Search tags for this page
canon flash at end of exposure
,
d800 flash fire at end of exposure
,
end of exposure flash
,

flash at end of exposure

,

flash at the end of exposure

,
flash fire at end of exposure
,
how do you set up a flash to go off at end of exposure
,
how to get your external flash to fire at the end
,
how to set canon 580ex ii to fire at end of exposure
,
long exposure, flash at the end canon