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04/11/2002 10:47:12 AM · #1 |
Does anyone know if it is possible to make a long exposure and fire the flash at the END of the exposure? I don't believe my camera will do this... The flash fires as soon as the shutter opens.
I was just playing with an idea... I had an idea for a stopped motion photo that would incorporate long exposure times and freeze the motion by flashing the subject at the end of the exposure interval. I am using the Sony DSC-F707, and as far as I can tell, this is impossible. My camera has the capability of using an external flash. Would the external flash offer this functionality? I also have a hand held flash that I can fire at will, but synchronizing this with the end of an exposure interval is also quite impossible....
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04/11/2002 11:26:17 AM · #2 |
What you're after is called slow-synch, 2nd curtain flash. Slow-synch allows you to combine available light with the flash by firing at the beginning (1st curtain) or end (2nd curtain) of a longer exposure. It's entirely dependent on the circuitry in the camera. Don't know if the 707 supports it, but a quick look at the flash modes or manual should tell you.
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04/11/2002 11:30:07 AM · #3 |
What I've done for this is to build an infrared timer circuit, that gets triggered when something passes through the beam. I use this timer to trigger an external flash gun.
Requires a bit of electronics knowledge to do though - you can buy systems to do this but it costs a lot. ($2 worth of parts from Fry's vs a $500 pre-built box)
I may even get it working in time to enter this weeks challenge!
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04/11/2002 11:46:58 AM · #4 |
| I was considering doing something similar for this challenge, but I really don't have time to do it this week. I'm hoping something good presents itself for this challenge, because I'm otherwise at a bit of a loss... |
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04/11/2002 12:28:27 PM · #5 |
Originally posted by irae:
What you're after is called slow-synch, 2nd curtain flash.
My F707 doesn't seem to support slow synch. My FD95 had the slow synch mode but I don't think it was adjustable to beginning or end of exposure...
Oh well... It was a good idea anyway...
I managed to capture photo today that I will be using as a backup photo if my primary idea doesn't work out, so I think I'm doing OK at this point. My primary idea will be photographed on Saturday and I'm looking forward to a good shot out of that... ;)
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04/11/2002 12:47:42 PM · #6 |
Here's a tip that some others may want to try...
My STOPPED MOTION photo that I'm planning to make this weekend will be (roughly) a 2" exposure (yes.. two seconds) at F2.5 and probably an ISO setting of 200.
I plan to make my photo by firing a disconnected hand held portable flash unit at my subject in total (or near total) darkness after the shutter opens. I will set my focus manually with the lights on and then I will begin making photos...
I have chosen this particular method on this photo so that I may change the direction from which the flash is coming. I am finding that flashing head on is creating some shadows and glares that I can do without.. This will also allow me to try flashing my subject from the rear at various angles as well.
I just thought I would pass this along.. I have noticed several comments about having a difficult time coming up with an idea....
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04/11/2002 01:03:54 PM · #7 |
The F-707 does have slow sync, sort of. It is the Twilight mode under the Scn selection. It basically slows the shutter speed and fires the flash at the beginning. Fairly limiting but decent for some stuff. I just remembered that you can manually set your shutter to anything you want and force the flash on. This will also fire the flash in the beginning only, but at least you have control over the time of the shutter. I've heard of people using a handheld flash and 'test' firing it at the proper moment after a long exposure. To me it doesn't seam to be much more difficult then if you had rear curtain syn from your camera, it seams that both ways would take a little practice to get the timing down, but very possible.
Tim J |
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