Go Back   Steve's Digicams Forums > Digicam Help > Flash (External)

Thread Tools Search this Thread
Old Jun 26, 2013, 2:10 PM   #1
Senior Member
Join Date: Dec 2005
Posts: 184
Default 2nd curtain question

Trying to learn more about second curtain.my understanding was that it fired at the end of the shot. I was playing with bulb mode to see if it does fire at the end. Held shutter open a few seconds and when I released the shutter it did fire but the flash also fired at the beginning so the flash actually fired twice. What am I missing? Thanks
camerageak is offline   Reply With Quote
Sponsored Links
Old Jun 26, 2013, 4:44 PM   #2
Senior Member
Join Date: Jan 2011
Location: Australia, New South Wales central coast
Posts: 2,808

G'day mate

My understanding is that all flash systems [in-camera eTTL + external TTL] will flash multiple times - I have seen it many times in workshops etc

The first flash is a pre-flash to determine final exposure;
often the 2nd flash is the anti-red eye flash, and
the 3rd & final flash is the actual exposure

As the shutter does not fire until the final flash, the previous flashes are not recorded

I cannot comment regarding the use of Bulb - you can help us all out with this one though ... Q: when on bulb let the pre-flash go off, cover the lens momentarily and fire the shutter to force the main flash ... does anything show on the image from the pre flash??

Has Fuji & Lumix superzoom cameras and loves their amazing capabilities
Google me at Travelling School of Photography Australia
Recent images at http://www.flickr.com/photos/ozzie_traveller/sets/
Ozzie_Traveller is offline   Reply With Quote
Old Jun 27, 2013, 4:59 PM   #3
Senior Member
VTphotog's Avatar
Join Date: Mar 2005
Location: Extreme Northeastern Vermont, USA
Posts: 4,164

Phil's comment is likely correct. I have never tried using auto flash with bulb mode - didn't expect it to work.
IIRC, the pre-flash for metering occurs before the shutter opens, so it should not affect the final exposure. If the shutter is open too long in bulb, the additional light from the trailing curtain flash could cause the final result to be overexposed, though.

VTphotog is offline   Reply With Quote
Old Jun 28, 2013, 3:40 AM   #4
Senior Member
Join Date: Sep 2011
Location: Bangor,North Wales
Posts: 3,691

You may find that the initial flash was for pre-focusing,if you were in poor light...?
SIMON40 is offline   Reply With Quote

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

All times are GMT -5. The time now is 11:27 AM.