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question about ambient light

pasknucklehead

US
1527 posts

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pasknucklehead Silver Member Nikonian since 05th Feb 2008
Sun 26-Aug-12 02:31 AM

Hey, hi everyone, had a question about ambient light and understanding the difference between using a flash set to my sync speed of 200 on my d90 or setting it lower say 1/60. I was trying to figure it out myself in a dim room but I was just confusing myself that much more. I know that you all said that if I used my flash at 200 I would see more of the background ambient light correct? or was it the other way around. Which way does it make the background almost black and does that have to be when the lights are dim? I am confused, go figure huh! thanks friends.

Darlene

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aolander

Nevis, US
3972 posts

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#1. "RE: question about ambient light" | In response to Reply # 0

aolander Silver Member Nikonian since 15th Sep 2006
Sun 26-Aug-12 02:51 AM | edited Sun 26-Aug-12 10:35 AM by aolander

Think about when taking a photograph of any scene (no flash). The faster the shutter speed (aperture staying the same), the more underexposed (darker) the image gets. It's the same thing when using flash for the subject and ambient light for the background. The subject will be correctly exposed by the flash at any shutter speed (at or below the sync speed), but the background will become progressively darker the faster the shutter speed.

When the lights are dim, it will be quite easy to make the background black because you'd have to use a large aperture and slow shutter speed to expose the background correctly. For example, if the room lighting would require an aperture of f/2.8 at 1/30th for a correct exposure, shooting at f/5.6 and 1/200th with a flash would underexpose the background by 5 stops.

Alan

pasknucklehead

US
1527 posts

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#2. "RE: question about ambient light" | In response to Reply # 1

pasknucklehead Silver Member Nikonian since 05th Feb 2008
Mon 27-Aug-12 10:39 PM

There goes that lightbulb off in my head...makes perfect sense,,,Thanks aolander...greatly appreciate it....

Darlene

Visit my Nikonians gallery.

G