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Flash & Long exposure
Old 12-10-2005, 10:04 PM   #1 (permalink)
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I need help, I was trying to capture the ambient light in this picture mixing it with flash but the model came up with movement, can I make something to correct this. My setup was speed 3 seconds, I think f/8 with an alien bee 800 with beauty dish and a Nikon d70s.

[img]/ubbthreads/images/graemlins/confused.gif[/img]
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Re: Flash & Long exposure
Old 12-10-2005, 10:09 PM   #2 (permalink)
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I didn't get the image, link's busted, but... What you need is to set your flash sync to 'slow' or 'rear curtain'... and keep the camera still. Turning off the modeling lights helps too.

Merry xmas!



Chip
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Link is okay... just slow loading.
Old 12-10-2005, 10:27 PM   #3 (permalink)
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Link is okay... just a slow loading image.

Keeping the camera still won't help if the model moves.

It appears that the ambient light was sufficient to expose the model's finger movement. Although it sorta looks like the strobe may have gone off twice.

Didn't have an on-camera flash active during the shoot by any chance? Was the Alien Bee modeling light on?
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Re: Link is okay... just slow loading.
Old 12-10-2005, 10:36 PM   #4 (permalink)
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Yep, I see it now.
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Re: Flash & Long exposure
Old 12-10-2005, 10:48 PM   #5 (permalink)
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Now that I see the image, I can add something. You could turn the output down on your strobe and open the aperture some to collect a little more ambient light. See if you can get it to f5.6 and 1 or 2 secs. Since the ambient light is all behind her, rear curtain or slow sync will do it. The light registering in the ghosted part of the image is probably your modeling light. Try turning it down till it's just barely bright enough to focus.

I've got an old friend in Monterrey, Dr. Jose David Ortiz, haven't seen him in a few years though.

Here's what happens when you shake the camera with rear curtain sync...


Chip
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Re: Flash & Long exposure
Old 12-11-2005, 12:08 AM   #6 (permalink)
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Alex,

I can't see the image and I am sure without reading some responses you have been helped.

But, to sum it up. You need to control the ambient light with your f-stop by using a wider aperture setting. Cut the power down on your flash unit to control it.

This is where you had too much power with the 800 so scale the power setting down. Not sure what lens or ISO setting you had but I would also try to get your aperture to 2.8 and a shutter speed of about 1/8 to 1/15. Model stands still and try that.

J T

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Re: Flash & Long exposure
Old 12-11-2005, 12:16 AM   #7 (permalink)
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Thank you I will try doing some more pictures to see the results. [img]/ubbthreads/images/graemlins/wink.gif[/img]
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Re: Flash & Long exposure
Old 12-11-2005, 09:09 AM   #8 (permalink)
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[ QUOTE ]
...can I make something to correct this...

[/ QUOTE ]

If you're wanting something that helps the model NOT move, then something for her to rest against where she gets a tacticle response (she FEELS it) when she moves. With her hand stuck up in the air like that in an unnatural pose, she's got nothing to help her hold still.

My other comment would be about the overall exposure - were you happy with it? She's exposed well, but the background looks, to me, a bit dark in the area of the buidlings and too light in the area of the sky (and there's a whole bunch of empty sky up there - was that intentional?).

The other guys have given you some examples of things you could do... here's my $.02:

    [*]Figure out your base expsoure - I'd aim for a shorter expsoure with a widet aperture to lessen the possibility of movement of the subject. Nail that exposure first, then...[*]Start off with the strobe turned down as far as you can and bring it up in very small increments until you've gotten the expsoure(s) you want[/list]
    You might also move so that you've got more lights and lit things in the background... a bit higher camera angle would lessen the blank sky and still get all that lovely young lady in the shot.

    Hang in there and keep trying!

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Re: Flash & Long exposure
Old 12-11-2005, 09:23 AM   #9 (permalink)
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This is of interest because of a project I'm about to start here in a couple nights.
Looking at this picture there is a white sign. One of my shots I'm planning will have a blue and white sign with lettering on it. I was going to try and have that in the background with an old rail station decorated with lights closer to the forground.
What is the thought here as to not only capturing the xmas lights but also the letting in the lighted sign. Will the long exposure white out the lettering?
This is something new for me, an experiment of sorts.

Thanks,
Frank
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