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Thread: lighting ratios (outdoors)

  1. #61

    Default Re: lighting ratios (outdoors)

    Quote Originally Posted by jeanie View Post
    i got the idea in mind.but at actualy shoot, i sure gabra.
    Don't gabra.. studio shoots just take your time..

  2. #62
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    Default Re: lighting ratios (outdoors)

    Will, using TTL with spot metering work? Meter for ambient, then set -3EV. Then use spot meter with TTL, should get the correct exposure for the subject, right? Haven't tried it out, just a hypothesis.

  3. #63

    Default Re: lighting ratios (outdoors)

    Quote Originally Posted by frenchbean View Post
    Will, using TTL with spot metering work? Meter for ambient, then set -3EV. Then use spot meter with TTL, should get the correct exposure for the subject, right? Haven't tried it out, just a hypothesis.
    By right yes.

  4. #64
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    Default Re: lighting ratios (outdoors)

    Hmm, why would anyone use a GND for portrait shoots
    If you understand my works, it's photography. If you don't, it's art.
    SplutterPhotography|flickr

  5. #65
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    Default Re: lighting ratios (outdoors)

    Quote Originally Posted by Splutter View Post
    Hmm, why would anyone use a GND for portrait shoots
    well no one... like i said in my last few post... she din mention what subject she is shooting... so GND is one of the option assuming it is landscape.

  6. #66

    Default Re: lighting ratios (outdoors)

    Quote Originally Posted by frenchbean View Post
    Will, using TTL with spot metering work? Meter for ambient, then set -3EV. Then use spot meter with TTL, should get the correct exposure for the subject, right? Haven't tried it out, just a hypothesis.
    Are you refering to manual exposure? If so, yes.

    If you are refering to exposure compensation at -3EV with auto metering (P, A or S), then it is wrong. You will then get the subject to be underexposed by 3 stop.

    To do it with manual exposure (M mode), find the shutter speed and aperture with spot metering on the background. Then set the aperture 3 stop smaller and shoot with spot meter on the subject with TTL flash (but I am not sure whether TTL works with spot metering or not).

    BC

  7. #67
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    Default Re: lighting ratios (outdoors)

    jeanie, say you want to do something like this
    http://forums.clubsnap.org/showthread.php?t=245560
    from my own thread

    The background was about 1/125, f4
    Subject is shade measures about 1/30, f4

    I wanted to underexp the background by 2 stops, so I shot at 1/250, f5.6
    Obviously now the subject will be very much underexposed, something like 4 stops.
    What I did was I had a strobe firing at about f5.6, so I get the subject properly exposed with a underexposed background. I had a light meter with me, though I seldom use it anymore. Can just guesstimate nowadays. Using a normal speedlite, you can roughly do the same, just compensate and +EV either through your ETTL/ITTL wateva or manually.
    If you understand my works, it's photography. If you don't, it's art.
    SplutterPhotography|flickr

  8. #68
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    Default Re: lighting ratios (outdoors)

    Quote Originally Posted by Scaglietti View Post
    Are you refering to manual exposure? If so, yes.

    If you are refering to exposure compensation at -3EV with auto metering (P, A or S), then it is wrong. You will then get the subject to be underexposed by 3 stop.

    To do it with manual exposure (M mode), find the shutter speed and aperture with spot metering on the background. Then set the aperture 3 stop smaller and shoot with spot meter on the subject with TTL flash (but I am not sure whether TTL works with spot metering or not).

    BC
    i think ttl still works with spot metering, but not ttl-balance

  9. #69

    Default Re: lighting ratios (outdoors)

    splut,
    give me sometime to digest.had a full lunch.cant think now.

  10. #70
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    Default Re: lighting ratios (outdoors)

    Quote Originally Posted by jeanie View Post
    splut,
    give me sometime to digest.had a full lunch.cant think now.
    actually, the easiest thing is, go out with one of the masters, get a model, then experiment.

    It's always easier to show than to write.

  11. #71

    Default Re: lighting ratios (outdoors)

    Quote Originally Posted by Splutter View Post
    jeanie, say you want to do something like this
    http://forums.clubsnap.org/showthread.php?t=245560
    from my own thread

    The background was about 1/125, f4
    Subject is shade measures about 1/30, f4

    I wanted to underexp the background by 2 stops, so I shot at 1/250, f5.6
    Obviously now the subject will be very much underexposed, something like 4 stops.
    What I did was I had a strobe firing at about f5.6, so I get the subject properly exposed with a underexposed background. I had a light meter with me, though I seldom use it anymore. Can just guesstimate nowadays. Using a normal speedlite, you can roughly do the same, just compensate and +EV either through your ETTL/ITTL wateva or manually.
    splut i dont get it.u fire the subject at f5.6, but you mentioned it's already 4 stops under.you mean you set your flash to f5.6 manually?then what about shutter speed?

    and when u mention subject is in shade and measures about 1/30 f4, is that with flash or just ambient spot metering on face?

  12. #72

    Default Re: lighting ratios (outdoors)

    Quote Originally Posted by jeanie View Post
    splut i dont get it.u fire the subject at f5.6, but you mentioned it's already 4 stops under.you mean you set your flash to f5.6 manually?then what about shutter speed?

    and when u mention subject is in shade and measures about 1/30 f4, is that with flash or just ambient spot metering on face?
    Flash exposure is not affected by shutter speed. (The flash duration is very much shorter than the shutter speed.)

    The idea is to underexpose the background. The background is not illumnated by flash (or strobe). Therefore, when the camera is set to 1/250 f/5.6 (ambient is 1/125 f/4), the background will be underexposed by 2 stops.

    Now you set the flash (or strobe) to f/5.6 to illuminate your subject. (Since now your camera is set at 1/250 f/5.6 and subject is in shade with ambient metering of 1/30 f/4 which is 4 stops under w/o flash.)... or use TTL.

    BC
    Last edited by Scaglietti; 5th January 2007 at 03:16 PM.

  13. #73

    Default Re: lighting ratios (outdoors)

    Quote Originally Posted by Scaglietti View Post
    Flash exposure is not affected by shutter speed. (The flash duration is very much shorter than the shutter speed.)

    The idea is to underexpose the background. The background is not illumnated by flash (or strobe). Therefore, when the camera is set to 1/250 f/5.6 (ambient is 1/125 f/4), the background will be underexposed by 2 stops.

    Now you set the flash (or strobe) to f/5.6 to illuminate your subject. (Since now your camera is set at f/5.6.)... or use TTL.

    BC

    so if i set my flash to 5.6, it will be underexposed by 1 stop isnt it?since the correct reading for the subject is f4 1/30s?no?

    also, since flash is not affected by shutter speed, why does my camera has this flash FP to sync with the flash?

    i totally LOST season 3.

  14. #74

    Default Re: lighting ratios (outdoors)

    Quote Originally Posted by jeanie View Post
    so if i set my flash to 5.6, it will be underexposed by 1 stop isnt it?since the correct reading for the subject is f4 1/30s?no?

    also, since flash is not affected by shutter speed, why does my camera has this flash FP to sync with the flash?

    i totally LOST season 3.
    edited my post to make it more understandable... read it again...

    BC

  15. #75

    Default Re: lighting ratios (outdoors)

    Quote Originally Posted by jeanie View Post
    ...
    also, since flash is not affected by shutter speed, why does my camera has this flash FP to sync with the flash?

    ...
    FP has nothing to do with exposure... but syncronisation...

    This one is a long story... have to explain to you another time....


    BC

  16. #76
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    Default Re: lighting ratios (outdoors)

    Apply the theory of KISS - Keep It Simple S.....

    I'll repeat what I wrote earlier

    Use your camera to meter the ambient.
    Go to M mode on your camera, and adjust your settings so that ambient is 3 stops under.
    Put your flash to standard TTL (or AA mode will also work) - don't mess with manual flash unless you know what you are doing.
    Fire away.

  17. #77

    Default Re: lighting ratios (outdoors)

    read already.

    Now you set the flash (or strobe) to f/5.6 to illuminate your subject. (Since now your camera is set at 1/250 f/5.6 and subject is in shade with ambient metering of 1/30 f/4 which is 4 stops under w/o flash.)... or use TTL.

    so, whether i set to 5.6 on flash or not, has absolutely no relevance on my initial reading of 1/30 f4?
    cos it doenst matter what the initial reading for subject is SINCE i'm going to set to the final ambient exposure(what i wanted, in this mentioned case, 2 stops under) aperture of 5.6 right?

    so what's the relevance of stating the 4 stops under without flash?

  18. #78

    Default Re: lighting ratios (outdoors)

    i'm going to print out this thread for my next shoot, and try everything you guys mentioned...
    man...this is gonna be a 'project' for me siah!

  19. #79

    Default Re: lighting ratios (outdoors)

    Quote Originally Posted by Scaglietti View Post
    FP has nothing to do with exposure... but syncronisation...

    This one is a long story... have to explain to you another time....


    BC
    explain flash FP to me.till now, i still dont really know what the hell it does other than to let me sync my shutter speed with the flash.

    yu have my email.

  20. #80

    Default Re: lighting ratios (outdoors)

    Quote Originally Posted by jeanie View Post
    read already.

    Now you set the flash (or strobe) to f/5.6 to illuminate your subject. (Since now your camera is set at 1/250 f/5.6 and subject is in shade with ambient metering of 1/30 f/4 which is 4 stops under w/o flash.)... or use TTL.

    so, whether i set to 5.6 on flash or not, has absolutely no relevance on my initial reading of 1/30 f4?
    cos it doenst matter what the initial reading for subject is SINCE i'm going to set to the final ambient exposure(what i wanted, in this mentioned case, 2 stops under) aperture of 5.6 right?

    so what's the relevance of stating the 4 stops under without flash?
    I think what Splutter is trying to say is that without the flash, but with the subject in the shade, the subject will be underexposed by 4 stops... therefore he used a strobe to light the subject at f/5.6...

    BC

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