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alexanderbaxter

Mesa, US
157 posts

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alexanderbaxter Registered since 18th Aug 2008
Sat 07-Mar-09 02:24 PM

Hi!
I'm somewhat new to flash photography but am trying to learn how everything works. I have a D80 and a SB800 mounted on the camera. The other evening I was out in my back yard about 6:00 P.M. (75 degrees, sorry) taking flash pictures and using ambient light. My camera flash mode was slow/rear. My ISO was 400. I was in Aperture Priority with f3.5 setting on my 18-135 lens. My SB800 was set at TTL BL FP. This worked great. My pictures were just what I wanted. My question is why did the flash fire twice? It was my understanding that in slow/rear the front curtain will raise, the sensor will gather ambient light, the flash will fire and then the rear curtain will close. It seems that the flash is firing after the front curtain opens and again before the rear curtain closed. Any help in understanding how this works would be greatly appreciated.
Alex

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