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FORUMS General Gear Talk Flash and Studio Lighting 
Thread started 17 May 2008 (Saturday) 18:43
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Underexposing skies

 
bmynbr
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May 17, 2008 18:43 |  #1

OK, I think I understand how to do this, but I want to make sure that what I am thinking is really what I should be
I want to take shots outside, and I want the sky to be underexposed.
I get a exposure reading for the sky, say f16 1/125
adjust flash to expose the subject properly
then change the shutter speed to say 1/250
that should underexpose the sky by one stop, am I correct

Still very new to flash photography, so any help would be appreciated, but my understanding is aperture changes subject, shutter changes background

I hope I am starting to understand this.

Thanks, Dave


Canon 7d, 50 f1.8, Canon 17-85is usm, 58mm hoya cpl, 67mm b&w slim cpl, Manfrotto 190 tripod with 486rc2 ball head, Canon efs 10-22, 580exII, cybersyncs, Canon 70-200 f4L

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Jarrad
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May 17, 2008 18:48 |  #2

Yes, it will be one stop below your inital reading. I hope your flash and body can sync at 1/250.


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bmynbr
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May 17, 2008 18:51 |  #3

Ya, not sure. I think it is 1/200 actually. But the theaory of what I was saying was right, right?

Here is a link to one of jacobthephotographers videos that does what I am thinking
http://youtube.com/wat​ch?v=tQKqj4W0QWI (external link)

I think I am allowed to post a link, if not please remove..
Thanks again Dave


Canon 7d, 50 f1.8, Canon 17-85is usm, 58mm hoya cpl, 67mm b&w slim cpl, Manfrotto 190 tripod with 486rc2 ball head, Canon efs 10-22, 580exII, cybersyncs, Canon 70-200 f4L

http://www.treklens.co​m/members/BMYNBR/photo​s/ (external link)

  
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Jarrad
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May 17, 2008 19:00 |  #4

bmynbr wrote in post #5544540 (external link)
But the theaory of what I was saying was right, right?


Yes :)


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bmynbr
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May 17, 2008 19:16 |  #5

cool, thanks.
I guess I just need to get out and practice. And with this lovely lower mainland weather, I should be able to do lots this weekend.
Dave


Canon 7d, 50 f1.8, Canon 17-85is usm, 58mm hoya cpl, 67mm b&w slim cpl, Manfrotto 190 tripod with 486rc2 ball head, Canon efs 10-22, 580exII, cybersyncs, Canon 70-200 f4L

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ghosh
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May 18, 2008 11:07 |  #6

bmynbr wrote in post #5544502 (external link)
I get a exposure reading for the sky, say f16 1/125
adjust flash to expose the subject properly
then change the shutter speed to say 1/250
that should underexpose the sky by one stop, am I correct

I am little confused with what you are saying.
sky exp = f16 1/125 (what you get)
Now you set flash to subject exp f16 and 1/250? is that what you mean? if this is, I think this should work.


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int main() {
std::cout << "POTN is the best." << std::endl;
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Curtis ­ N
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May 18, 2008 11:23 |  #7

Ghosh,

You set your flash for proper exposure at f/16. The shutter speed won't affect the flash exposure. So you can change the ambient exposure by changing the shutter speed. In this case the OP can reduce the ambient exposure by 1 stop, by doubling the shutter speed.


"If you're not having fun, your pictures will reflect that." - Joe McNally
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Polekat
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May 18, 2008 11:37 |  #8

If you are using a flash with TTL capabilities would you need to adjust the flash setting at all? Wouldn't you be able to meter off the sky to get the proper exposure of that, then point at your subject and fire away?


Just learning the ropes. My equipment:
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50mm f/1.8, Canon 70-200L f/4
580 EXII

  
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Curtis ­ N
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May 18, 2008 12:05 |  #9

Polekat wrote in post #5547944 (external link)
If you are using a flash with TTL capabilities would you need to adjust the flash setting at all? Wouldn't you be able to meter off the sky to get the proper exposure of that, then point at your subject and fire away?

Theoretically, yes. But some tweaking of FEC may still be required, depending on certain factors like subject luminance (light or dark clothing).


"If you're not having fun, your pictures will reflect that." - Joe McNally
Chicago area POTN events (external link)
Flash Photography 101 | The EOS Flash Bible  (external link)| Techniques for Better On-Camera Flash (external link) | How to Use Flash Outdoors| Excel-based DOF Calculator (external link)

  
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Underexposing skies
FORUMS General Gear Talk Flash and Studio Lighting 
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