Wow... the 580EXII is pretty powerful... heres proof!

M Powered wrote in post #5924597
Really? Why?

I presume you are learning, and not merely asking to be humorous...

If you shoot a flash shot and light the subject (subject) but not the background, it would matter not if they were in a slum or in a mansion. But if you light the subject with the flash and use available light to also record the background, then it is possible to tell that the bride's parents sprang for a very fancy wedding at the mansion in town. It captures the setting, so that those who were not there can see the opulence, that's why

Wilt wrote in post #5924727
I presume you are learning, and not merely asking to be humorous...

If you shoot a flash shot and light the subject (subject) but not the background, it would matter not if they were in a slum or in a mansion. But if you light the subject with the flash and use available light to also record the background, then it is possible to tell that the bride's parents sprang for a very fancy wedding at the mansion in town. It captures the setting, so that those who were not there can see the opulence, that's why

So what you are referring to is light spill. Excess light that spreads past your intended subject... For larger strobes I use grids and angle the light accordingly.

But yes, I try not to light the background unless I want the viewer to know the environment, which is the entire reason why I used the 580EXII to light the waterfall in the back as opposed to leaving it completely dark.

M Powered wrote in post #5924772
So what you are referring to is light spill. Excess light that spreads past your intended subject... For larger strobes I use grids and angle the light accordingly.

But yes, I try not to light the background unless I want the viewer to know the environment, which is the entire reason why I used the 580EXII to light the waterfall in the back as opposed to leaving it completely dark.

No, not 'light spill', it is controlled use of the ambient light that falls on the background, and using it to register that background in the photo, rather than letting it merely be -2EV more more darker than the flash which is put onto the subject.

The light from the flash, which falls onto the subject, might decrease so much in intensity by the time that it reaches the background that it contributes little to the background lighting. For example if your flash were 5.5' from your subject, by the time it is 32' away, it is -5EV in intensity merely due to the Inverse Square law. You must 'drag the shutter' to allow the available light in the scene to accumulate, as the -5EV flash is a brief 1/1000 of a second and dragging the shutter does NOTHING to accumulate any more light from the flash.

Wilt wrote in post #5925183
No, not 'light spill', it is controlled use of the ambient light that falls on the background, and using it to register that background in the photo, rather than letting it merely be -2EV more more darker than the flash which is put onto the subject.

The light from the flash, which falls onto the subject, might decrease so much in intensity by the time that it reaches the background that it contributes little to the background lighting. For example if your flash were 5.5' from your subject, by the time it is 32' away, it is -5EV in intensity merely due to the Inverse Square law. You must 'drag the shutter' to allow the available light in the scene to accumulate, as the -5EV flash is a brief 1/1000 of a second and dragging the shutter does NOTHING to accumulate any more light from the flash.

Wilt,,yeah.. Check out Inverse Square Law of light..

Any point source which spreads its influence equally in all directions without a limit to its range will obey the inverse square law. This comes from strictly geometrical considerations. The intensity of the influence at any given radius r is the source strength divided by the area of the sphere. Being strictly geometric in its origin, the inverse square law applies to diverse phenomena. Point sources of gravitational force, electric field, light, sound or radiation obey the inverse square law. It is a subject of continuing debate with a source such as a skunk on top of a flag pole; will it's smell drop off according to the inverse square law?

Wilt wrote in post #5925183
No, not 'light spill', it is controlled use of the ambient light that falls on the background, and using it to register that background in the photo, rather than letting it merely be -2EV more more darker than the flash which is put onto the subject.

The light from the flash, which falls onto the subject, might decrease so much in intensity by the time that it reaches the background that it contributes little to the background lighting. For example if your flash were 5.5' from your subject, by the time it is 32' away, it is -5EV in intensity merely due to the Inverse Square law. You must 'drag the shutter' to allow the available light in the scene to accumulate, as the -5EV flash is a brief 1/1000 of a second and dragging the shutter does NOTHING to accumulate any more light from the flash.

Inverse square law wilt. You already did trig, lit.. add physics to the mix!

Edit: Bah.. yogestee beat me to it..

Wilt wrote in post #5925183
No, not 'light spill', it is controlled use of the ambient light that falls on the background, and using it to register that background in the photo, rather than letting it merely be -2EV more more darker than the flash which is put onto the subject.

The light from the flash, which falls onto the subject, might decrease so much in intensity by the time that it reaches the background that it contributes little to the background lighting. For example if your flash were 5.5' from your subject, by the time it is 32' away, it is -5EV in intensity merely due to the Inverse Square law. You must 'drag the shutter' to allow the available light in the scene to accumulate, as the -5EV flash is a brief 1/1000 of a second and dragging the shutter does NOTHING to accumulate any more light from the flash.

Yea, tell that to a model. Hey Honey, your standing 6' away, I need you to be at 5'5"

I'm aware that you have to drop shutter speed to capture more ambient, and to compensate you have to drop the power of the strobe not to over expose the subject.

Ya DiG?

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M Powered wrote in post #5928688
Yea, tell that to a model. Hey Honey, your standing 6' away, I need you to be at 5'5"

I'm aware that you have to drop shutter speed to capture more ambient, and to compensate you have to drop the power of the strobe not to over expose the subject.

Ya DiG?

Hmm, the folks who worry about photos viewed while at work are gonna sweat again!

BTW, if you drop shutter speed to capture more ambient, there is not that much accumulation of exposure in dragging the shutter to require a lot of correction...

If flash exposure was f/5.6, and you are dragging shutter to 1/8 to capture ambient at f/5.6 to -1EV relative brightness (to direct viewer's attention to the model) the added light due to ambient would only be adding 0.5EV of light to the model. If relative background was a -1.5EV, the added light due to ambient would only be adding 0.3EV of light to the model.

Wilt wrote in post #5928863
Hmm, the folks who worry about photos viewed while at work are gonna sweat again!

BTW, if you drop shutter speed to capture more ambient, there is not that much accumulation of exposure in dragging the shutter to require a lot of correction...

If flash exposure was f/5.6, and you are dragging shutter to 1/8 to capture ambient at f/5.6 to -1EV relative brightness (to direct viewer's attention to the model) the added light due to ambient would only be adding 0.5EV of light to the model. If relative background was a -1.5EV, the added light due to ambient would only be adding 0.3EV of light to the model.

Whats all this talk of -1 EV + MC2 +5EV stuff? Is that light meter talk? Because if it is, I'm totally lost because I don't use em I'm simple, set my aperture and eye ball my light setting. Max sync speed for my strobes are 1/250sec and I try to keep it above 1/125sec to avoid any motion blur. If I need more ambient I bump the ISO and drop the power on the lights.

M Powered wrote in post #5928980
Whats all this talk of -1 EV + MC2 +5EV stuff? Is that light meter talk? Because if it is, I'm totally lost because I don't use em I'm simple, set my aperture and eye ball my light setting. Max sync speed for my strobes are 1/250sec and I try to keep it above 1/125sec to avoid any motion blur. If I need more ambient I bump the ISO and drop the power on the lights.

His point is just that dropping your shutter speed has almost no effect on the light levels on the subject, just the background, if the subject is dark and you're using strobes. And you really don't need to worry about motion blur with strobes, mind you, unless some significant part of the frame is lit by ambient. The flash of a photographic strobe isn't nearly long enough for motion blur to occur in any normal situation.

M Powered wrote in post #5928980
Whats all this talk of -1 EV + MC2 +5EV stuff? Is that light meter talk?

Naw, its just basic photography lighting talk

M Powered wrote in post #5928980
Whats all this talk of -1 EV + MC2 +5EV stuff? Is that light meter talk? Because if it is, I'm totally lost because I don't use em I'm simple, set my aperture and eye ball my light setting. Max sync speed for my strobes are 1/250sec and I try to keep it above 1/125sec to avoid any motion blur. If I need more ambient I bump the ISO and drop the power on the lights.

Ignore 'metering'...the notations are merely shorthand ways to refer to the relative intensity of light in different locations or from different sources.

For example, if you measured light intensity in one place with your camera, and it says 1/200 f/4, then you measure in a second place and it says 1/25 f/4, the light in one place is '3 f/stops different': 1/200...1/100...1/50..​.1/25. so this can be expressed as location A is +3EV compared to location B, and it also can be expressed as location B is -3EV compared to location A!

Fractional differences can be expressed this way, too.
For example, if you measured light intensity in one place with your camera, and it says 1/200 f/4, then you measure in a second place and it says 1/125 f/4, the light in one place is '2/3 f/stops different'. So this can be expressed as location A is +2/3EV compared to location B, and it also can be expressed as location B is -2/3EV compared to location A!

bieber wrote in post #5929006
His point is just that dropping your shutter speed has almost no effect on the light levels on the subject, just the background, if the subject is dark and you're using strobes. And you really don't need to worry about motion blur with strobes, mind you, unless some significant part of the frame is lit by ambient. The flash of a photographic strobe isn't nearly long enough for motion blur to occur in any normal situation.

Almost everything I shoot has a small amounts of ambient in it. Models constantly move, unless told otherwise, so I need to make every effort to prevent motion blur

Wilt wrote in post #5929054
Ignore 'metering'...the notations are merely shorthand ways to refer to the relative intensity of light in different locations or from different sources.

For example, if you measured light intensity in one place with your camera, and it says 1/200 f/4, then you measure in a second place and it says 1/25 f/4, the light in one place is '3 f/stops different': 1/200...1/100...1/50..​.1/25. so this can be expressed as location A is +3EV compared to location B, and it also can be expressed as location B is -3EV compared to location A!

Fractional differences can be expressed this way, too.
For example, if you measured light intensity in one place with your camera, and it says 1/200 f/4, then you measure in a second place and it says 1/125 f/4, the light in one place is '2/3 f/stops different'. So this can be expressed as location A is +2/3EV compared to location B, and it also can be expressed as location B is -2/3EV compared to location A!

ahhh gotcha!

But I don't use a light meter

M Powered wrote in post #5906858
Here is a picture illustration. Assistant on the left is holding the positioned 580EXII with the PW mounted on top of the flash head.

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in my next life,,i want to come back as that rock:p

slowdad wrote in post #5929103
in my next life,,i want to come back as that rock:p

Not if you saw what was on top of that rock prior!