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Old Dec 26, 2011, 10:55 PM   #1
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Default Slow Sync 2nd Curtain Flash ?

Was messing about with my E-PL1 this evening taking shots of the Christmas tree, and started extending out the exposure time, panning and then adding flash. Tried using the Slow Sync 2nd curtain to freeze the image at the end of the exposure. What I noticed was the flash would fire when I tripped the shutter, and then fire again just before the shutter was set to close.

This caught me by surprise, the initial flash firing. I was only expecting the flash to fire at the end of the 10 second exposure.

Did some tests to see if the first pulse of the flash was actually occuring before or after the shutter opened (by sticking my finger in front of the flash). Seems the first pulse of the flash occurs before the shutter opens, so it does not affect the exposure.

Can't think why there would be the "pre-flash" -- red eye not turned on. I was shooting Manual, Shutter and then Aperture.Same flash pattern.

Just found this to be curious...
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Old Dec 26, 2011, 11:03 PM   #2
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If you were shooting in TTL flash mode, the pre-flash is used by the Olympus TTL system to calculate the appropriate amount of flash to emit. In second-curtain mode, the delay between the pre-flash and the exposure flash will be the longest possible, especially the longer the shutter speed you use.

If you turn TTL off and use non-TTL auto, the preflash will not happen.
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Old Dec 26, 2011, 11:32 PM   #3
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Thanks Greg
That makes sense. Right now I'm finding the flash just a little strong. So I'll have to spend some more "quality time" with the camera. The dog is getting a bit annoyed with all these flashes
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Old Dec 27, 2011, 12:26 AM   #4
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Quote:
Originally Posted by KulaCube View Post
Thanks Greg
The dog is getting a bit annoyed with all these flashes
So did my kitty. He eventually started turning his back on me after a shot or two and made this annoying sound, letting me know he'd had enough.
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Old Dec 27, 2011, 9:59 AM   #5
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Flash is annoying to both animals and people. I never use the red eye setting exactly because of the double-firing. People think you took the picture and move so when the camera actually takes the shot, people are in motion or have their eyes shut. Annoying to the photographer as well so I prefer to remove red eye through S/W.
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Old Dec 27, 2011, 10:21 AM   #6
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Hah! Reminds me of when my sister had a 8mm movie camera (many moons ago) and had this bar that held four bright spotlights which you used for filming indoors. She would bring that out at Christmas time and shoot video of us unwrapping gifts. Anyone looking at her would have their eyes closed because it was so darn bright. Boy, we sure have come a long ways since that time.
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