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FORUMS Photography Talk by Genre Glamour & Nude Talk 
Thread started 25 Sep 2008 (Thursday) 22:34
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Lighting

 
themirage
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Sep 30, 2008 23:41 as a reply to  @ post 6413812 |  #16

Okay Bieber, I may have my terminology wrong but I think what I'm trying to say is sound. Below are two images with the same aperture and ISO. The only difference being the shutter speed. You can see that the one with the slower shutter speed lets the light 'spread' far enough to hit the gray paper 8ft back and make it lighter than the other photo.

Faster Shutter Speed


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Slower Shutter Speed


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themirage
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Sep 30, 2008 23:43 as a reply to  @ themirage's post |  #17

Anyhow here's a pic kind of like those he was trying to create using the same model used above.


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bieber
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Oct 01, 2008 06:46 |  #18

That's not the light from the strobe "spreading," that's ambient affecting your exposure. Most of it probably from your strobe's modeling light, which is giving you the impression that the strobe itself is somehow burning in longer.


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Mark1
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Oct 01, 2008 09:42 |  #19

My guess it is something like this....

IMAGE NOT FOUND
IMAGE IS A REDIRECT OR MISSING!
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Big box to soften the light, but far enough away to make it a bit directional again.

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themirage
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Oct 01, 2008 10:30 |  #20

bieber wrote in post #6415245 (external link)
That's not the light from the strobe "spreading," that's ambient affecting your exposure. Most of it probably from your strobe's modeling light, which is giving you the impression that the strobe itself is somehow burning in longer.

The modeling light is off when the photo is taken. I've tried it again without the modeling lamp, dark room so I had to lock the focus, and the result is the same.

Now that being said, you can reduce the amount of light the spreads out that way by gridding the softbox to keep the direction of the light more focused on the subject.


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bieber
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Oct 01, 2008 10:53 |  #21

themirage wrote in post #6416321 (external link)
The modeling light is off when the photo is taken. I've tried it again without the modeling lamp, dark room so I had to lock the focus, and the result is the same.

Now that being said, you can reduce the amount of light the spreads out that way by gridding the softbox to keep the direction of the light more focused on the subject.

The modeling lamp is off when the strobe goes off, but it should come right back on again afterwards. There is no way for light from a strobe to "spread" over time. It travels at, well, the speed of light, and it's gone its course in a much, much shorter time than even the 1/250 of a second that your shutter is open at the max sync speed. Anything that comes in after that is ambient.


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themirage
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Oct 01, 2008 12:04 as a reply to  @ bieber's post |  #22

Alright. I'll leave this one alone. I don't think we are going to come to a census on this. I think the Thread Author got his answer.


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mdmedicgod
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Oct 06, 2008 06:13 as a reply to  @ themirage's post |  #23

The one variable that wasn't asked.. What aperature were you shooting? I can use strobe in the broad daylight and have my subject lit but the background falls to black


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