An Incredily Newbie Type Question

Discussion in 'Photography Beginners' Forum' started by PhotoJunkieJen, Feb 10, 2009.

  1. PhotoJunkieJen

    PhotoJunkieJen TPF Noob!

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    So I'm actually a bit asahmed I have to ask this... but here goes.

    I understand about aperture and shutter speed. I understand, the faster the shutter, the lower the aperture and vice verse. I understand how to shoot on manuel and such.

    But what I don't understand is what someone means when they say to up or lower the exposure by a stop.. or 2/3 of a stop.

    Like, I understand that means "Change the Aperture." But how much exactly is a "stop"?
     
  2. Big Mike

    Big Mike I am Big, I am Mike Staff Member Supporting Member

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    A stop is a full halving or doubleing of the amount of light. So if you open then aperture enough to double the area, it's one full stop. From F8 to F5.6 (or F8 to F11) for example. You could also change the shutter speed by a stop by going from 1/30 to 1/60 (or 1/30 to 1/15).
    One stop is also 2X or 1/2 in ISO. 100 to 200 etc.

    To give us more precise adjustment, many cameras can now be adjusted to steps between full stops...that's where you get halves or thirds of a stop.
     
  3. tsaraleksi

    tsaraleksi TPF Noob!

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    1.0, 1.4, 2.0, 2.8, 4.0, 5.6, 8, 11, 16, 22. I believe those are the full stop that are of interest to 35mm photographers, but I can't ever remember the exact spaces between 1 and 1.4.
     
  4. Mongoos3

    Mongoos3 TPF Noob!

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    Manuel Settings??? I'm pretty sure your DSLR wasn't made in Mexico.
     
  5. wes

    wes TPF Noob!

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    When you look in your viewfinder there is a scale with 0 in the middle and then +/- settings to the left or right of 0. When someone says to adjust your exposure they are most likely refering to adjusting you exposure comp up or down to either under expose or over expose. I think that is what your are getting at.
     
  6. rufus5150

    rufus5150 TPF Noob!

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    1.0, 1.1, 1.2, 1.4 for 1/3rd stops, 1.0, 1.2, 1.4 for half stops. I think there's some rounding going on when you get down that far :)
     
  7. bigtwinky

    bigtwinky No longer a newbie, moving up!

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    You ensure a proper photographic exposure by using a mix of aperture, shutter speed and ISO. Each is changed depending on light and your artistic intent.

    When someone says to adjust the exposure, I would think they mean that you purposely over or under expose your picture, again, for artistic intent.

    You have a scale that typically goes from

    –2…-1…0…1…2

    When you meter a scene, you should be adjusting your aperture, shutter and ISO so your arrow is aligned with the 0 on the scale. If you want to under expose by 1/3 of a stop, but keep the same aperture / shutter / iso, you can move the arrow to the left of the 0, which would be between the –1 and the 0, closer to the 0.
     
  8. AlexColeman

    AlexColeman TPF Noob!

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    They have all told you, just letting in one more or less stop of light.
     
  9. TJ K

    TJ K No longer a newbie, moving up!

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    I got a good laugh out of this.
     
  10. PhotoJunkieJen

    PhotoJunkieJen TPF Noob!

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    Me too, that was pretty good. :lmao:
     
  11. PhotoJunkieJen

    PhotoJunkieJen TPF Noob!

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    So I see the logic in halving the shutter, ie: 1/120 to 1/60. And halving the ISO... from say 400 to 200.

    But the aperture? The math doesn't make sense? Is that just something I have to memorize?
     
  12. tsaraleksi

    tsaraleksi TPF Noob!

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    They're ratios. 1:1.4 1:5.6 or whatever. They just are what they are, memorizing them isn't hard if you shoot a lot.
     

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