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07/01/2005 07:09:30 PM · #1 |
Can anyone give me some advice on how much these 2 settings relate to each other.
I've been experimenting with different kinds of settings & their results & was wondering how big the ap should be if I increase shutter speed a bump & vice versa.
For instance, if I increase a 1/3 (less light), how much should I decrease the shutter speed? If I decrease ap (more light), how much should I increase shutter speed?
thanks in advance!
Peace
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07/01/2005 07:27:57 PM · #2 |
You can answer your own question. Put your camera in Av mode. Make a note of the shutter speed and the aperture. Use your little roller wheel at the top to increase or decrease the aperture. Make another note of how much the shutter speed changes. Make sense?
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07/01/2005 07:41:34 PM · #3 |
In order to get a well exposed image, a lower the aperture (AV higher f number) needs a lower speed (TV) and viceversa, and a higher aperture (lower f number) needs a faster speed. This means that an aperture i.e. of f2.8 (depending on the qtty. of light you have) needs les time to achieve the image to the sensor.
Mmmh.... OK, my english is not good enough to explain but hope this helps.
Message edited by author 2005-07-01 19:41:54. |
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07/01/2005 07:44:00 PM · #4 |
Originally posted by ramevi:
In order to get a well exposed image, a lower the aperture (AV higher f number) needs a lower speed (TV) and viceversa, and a higher aperture (lower f number) needs a faster speed. This means that an aperture i.e. of f2.8 (depending on the qtty. of light you have) needs les time to achieve the image to the sensor.
Mmmh.... OK, my english is not good enough to explain but hope this helps. |
I think he got it down, but maybe it's just a slight problem with translations. See if this makes more sense...
The smaller the aperture (higher the F number) the slower the shutter speed. The larger the aperture (lower the F number) the faster the shutter speed.
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07/01/2005 07:45:51 PM · #5 |
Originally posted by deapee:
Originally posted by ramevi:
In order to get a well exposed image, a lower the aperture (AV higher f number) needs a lower speed (TV) and viceversa, and a higher aperture (lower f number) needs a faster speed. This means that an aperture i.e. of f2.8 (depending on the qtty. of light you have) needs les time to achieve the image to the sensor.
Mmmh.... OK, my english is not good enough to explain but hope this helps. |
I think he got it down, but maybe it's just a slight problem with translations. See if this makes more sense...
The smaller the aperture (higher the F number) the slower the shutter speed. The larger the aperture (lower the F number) the faster the shutter speed. |
Thanks for the english lesson. :) |
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07/01/2005 07:53:35 PM · #6 |
To elaborate, for every full stop down in aperture size, e.g. f/2.8 to f/4, the aperture area, and thus the amount of light, is cut in half, so the shutter speed must be cut in half (time doubled). The following are all equivalent exposures:
1/100s @ f/2.8
1/50s @ f/4
1/25s @ f/5.6
1/12s @ f/8
The 1/2-stops and 1/3-stops are more difficult to calculate. Let your cam do that for you, by shooting in Av or Tv mode.
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07/01/2005 08:36:58 PM · #7 |
cool. I mean I know thw relation between ap & shutter... I was wondering if there was a loose method that folks used to adjust ap or shutter when adjusting one or the other.
The AV & TV modes use is a good idea. I will check things out & post when all experients are done.
Thanks guys!
peace!
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07/01/2005 08:40:55 PM · #8 |
I do it like this:
One click up = One click down on the other
One click down = One click up on the other
@_
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07/01/2005 08:49:25 PM · #9 |
This article (link) covers the relationship between and how the changes affect exposure -- and a method of learning to judge the exposure that is needed.
David
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