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November 1st, 2006, 04:42 AM
| #1 |
 Joined: Nov 25th, 2005 Last Online: Yesterday Location: It's complicated. Posts: 865
Rep Power: 13  |  Second Curtain Sync Flash? (350D) Just a question for anybody out there, and if you have a 350D and could try it for yourself, that'd be awesome: If I set custom function 5 (AF-assist beam) to 1: Does not emit and custom function 9 (Shutter curtain sync) to 1: 2nd-curtain sync, then I would have thought the flash should fire only once, when the shutter closes. However, the flash definitely fires twice. (You might have to set a long-ish shutter speed to be able to notice this) It fires once as soon as I press the shutter button, and once when the shutter closes. I don't think that the first flash shows up in the final photo, but I can't think of any reason why it would fire... any ideas? Sorry, I don't think this post is very well worded, but hopefully somebody can understand what I'm asking an help out. Thanks!
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November 1st, 2006, 06:17 AM
| #2 |
| Hormone Induced  Joined: Jun 21st, 2005 Last Online: 05:55 AM Location: Calgary, Alberta, Canada Posts: 5,784
Car: Pimpmobile Rep Power: 68  | The first flash is for the TTL flash metering, generally called a "preflash." It's when the camera looks at the image for a split second to make the power adjustments to the flash before making the exposure. It actually preflashes a number of imperceptible times, not just once. |
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November 2nd, 2006, 07:55 PM
| #3 |
 Joined: Mar 24th, 2005 Last Online: Yesterday Location: Waterford, Rep of Ireland Age: 22 Posts: 1,712
LFS Status:  Rep Power: 25   | Back off Nikon wh0re  Second curtain flash is usually known as Rear curtain flash to the Nikon boys, It's a trick I use when doing major slow pans, under 1/15 of a second. As BSC said, the first flash is a preflash to gauge how strong the flash should fire, and the second flash fires exactly before the shutter closes, freezing what ever is in the flash's range, retaining the background blur. It's also handy for night club photos, to help expose the background with wild colours and a clear, crisp foreground subject. Examples speak better than my unthought and unplanned words ...   EDIT: I'd also leave the AF Emit beam thingy on, its just a green beam that helps the camera focus at night  Last edited by Cosworth; November 2nd, 2006 at 08:03 PM.. |
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November 7th, 2006, 01:18 PM
| #4 | |
| Joined: Jan 3rd, 2005 Last Online: October 20th, 2008 Location: San Francisco, California Posts: 1,534
Rep Power: 17 | Quote:
__________________  My FlickR Gallery! Rig: Intel Core 2 Duo E8400 3.0ghz with Artic Freezer 7 Pro. 4gb PC6400. MSI 8800GT OC 512mb. 1.6TB of space. Logitech G25. Logitech G7 gaming mouse. Logitech VX Revolution. Saitek Eclipse Keyboard. Dell Ultrasharp 2407wfp-HC and Ultrasharp 2007wfp. Senheiser HD280 Headphones. | |
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November 8th, 2006, 09:05 PM
| #5 | |
| Hormone Induced Joined: Jun 21st, 2005 Last Online: 05:55 AM Location: Calgary, Alberta, Canada Posts: 5,784
Car: Pimpmobile Rep Power: 68 | Quote:
 ...but that does bring to mind a guy that came up to me in a bar when I was shooting, and proceeded to spend a quarter of an hour telling me that all Canon users are homosexual, and that if I talk to one, he will at some point ask for a blowjob. He was a drunk Olympus shooter, so I guess I can forgive him.  | |
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November 8th, 2006, 09:15 PM
| #6 |
| Joined: Mar 24th, 2005 Last Online: Yesterday Location: Waterford, Rep of Ireland Age: 22 Posts: 1,712
LFS Status: Rep Power: 25 | So, BSC, what you doing Friday ?  |
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November 9th, 2006, 03:28 AM
| #8 |
| Joined: Nov 25th, 2005 Last Online: Yesterday Location: It's complicated. Posts: 865
Rep Power: 13 | Haha, Thanks guys. Yeah, I'm aware what the second curtain sync flash does, and I use it sometimes, but I didn't think of the metering purpose of the preflash. It didn't help that the Canon rep I talked to said that there should definitely only be one flash... Guess they forgot about the preflash too. Anyway, glad that's cleared up, thanks!
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November 9th, 2006, 10:01 PM
| #9 | |
| Joined: Jun 30th, 2005 Last Online: November 30th, 2008 Posts: 243
Rep Power: 14 | Quote:
Didn't know the thing about the preflash though. It's quite smart, really
__________________ "But no car I’ve ever driven has a cockometer, a dial that shows how much of a penis you look as you drive from place to place." - Jeremy Clarkson | |
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