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Thread: Exposure compensation and Aperture/Shttuer settings

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    Default Exposure compensation and Aperture/Shttuer settings

    What's the difference between using exposure compensation and aperture/shutter settings to achieve over exposed or under exposed picture?

    I can change the aperture or shutter to make the picture over or under exposed in M mode, then when do I use the exposure compensation? Is it for fine tuning?

    Or exposure compensation is mainly used in P, A and S mode since the camera sets the aperture/shutter combination for us?

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    Senior Member luna_sea83's Avatar
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    Default Re: Exposure compensation and Aperture/Shttuer settings

    Exposure Compensation is mainly used in P,A and S mode

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    Senior Member Numnumball's Avatar
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    Default Re: Exposure compensation and Aperture/Shttuer settings

    Remember our eyes see things in perpetual continuty like a video but camera captures collective light in oics over a variable duration. To the camera,it's jus a circle and its eventual tonal intensity is quite variably dependent on the proportion it and the overall exposure set will affect it. Any brighter in life can eventually ends up darker in the final pic if the shutrter duration is short OR bright if the shutter duration is long.

    Thats where the Exposure compensation comes in where we need to tell the camera what to do by our manual judgement in which we deem to be too dark or bright..

    Like wad Luna_sea says : Exposure Compensation is mainly used in P,A and S mode and it's adjustable after exposure calculate based on ur metering modes..

    Hope the above helps

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    Senior Member ZerocoolAstra's Avatar
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    Default Re: Exposure compensation and Aperture/Shttuer settings

    Quote Originally Posted by LBL2009 View Post
    What's the difference between using exposure compensation and aperture/shutter settings to achieve over exposed or under exposed picture?

    I can change the aperture or shutter to make the picture over or under exposed in M mode, then when do I use the exposure compensation? Is it for fine tuning?

    Or exposure compensation is mainly used in P, A and S mode since the camera sets the aperture/shutter combination for us?
    If your camera is in Manual mode, you can try:

    1) set the aperture and shutter speed to whatever you think is the appropriate setting. Fire a shot.

    2) change the exposure compensation value, say, to +1EV. Fire a shot.

    review on your PC. Do you see any difference?
    that's your answer.

    oh i forgot. to be scientific, of course you have to keep the other variables the same. So best to mount on tripod and focus on the same object.
    Exploring! :)

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    Senior Member Diavonex's Avatar
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    Default Re: Exposure compensation and Aperture/Shttuer settings

    Quote Originally Posted by LBL2009 View Post
    What's the difference between using exposure compensation and aperture/shutter settings to achieve over exposed or under exposed picture?

    I can change the aperture or shutter to make the picture over or under exposed in M mode, then when do I use the exposure compensation? Is it for fine tuning?

    Or exposure compensation is mainly used in P, A and S mode since the camera sets the aperture/shutter combination for us?
    If you are using Automatic to: 1. shoot against the light 2. shoot a subject against a white/black background, you can use exposure compensation to correct the over/under exposure.
    Last edited by Diavonex; 2nd September 2009 at 10:40 AM.

  6. #6

    Default Re: Exposure compensation and Aperture/Shttuer settings

    Quote Originally Posted by ZerocoolAstra View Post
    If your camera is in Manual mode, you can try:

    1) set the aperture and shutter speed to whatever you think is the appropriate setting. Fire a shot.

    2) change the exposure compensation value, say, to +1EV. Fire a shot.

    review on your PC. Do you see any difference?
    that's your answer.

    oh i forgot. to be scientific, of course you have to keep the other variables the same. So best to mount on tripod and focus on the same object.

    Ah... Exposure compensation doesn't work in manual mode (i'm sure i think, i never use it in manual mode anyway can just adjust shutterspeed) It only moves ur Exposure bar left or right.

    Exposure compensation is for quick use in A S or P mode when the CPU sets the shutter speed/aperture or both for you, but it's still too dark or light to your liking, (since it's based on metering and you want to keep that setting to shoot) just hit Exposure compensation then change it to how u want to change the shot taken.



    Ok for example u r in A mode with F/2.8 which u want to take a photo with to create an effect with shallow DoF, CPU selects 1/500s for S speed based on matrix metering. But u took the shot and it's too bright. so u flip ur EC to -1.0 or w/e then shoot again.
    If you switch to f/5.6 to reduce light, the CPU will sellect 1/1000s to match the metering. if u go manual, and u reduce to f/5.6 and set to 1/500s, you loose your shallow DoF. Remember to check your histograms etc and see that nothing is blown or too dark.

    I hope it helped, and i'm not wrong. HAHA =X

  7. #7

    Default Re: Exposure compensation and Aperture/Shttuer settings

    Quote Originally Posted by LBL2009 View Post
    What's the difference between using exposure compensation and aperture/shutter settings to achieve over exposed or under exposed picture?

    I can change the aperture or shutter to make the picture over or under exposed in M mode, then when do I use the exposure compensation? Is it for fine tuning?

    Or exposure compensation is mainly used in P, A and S mode since the camera sets the aperture/shutter combination for us?
    i think you mean, P,A,S mode versus M mode.

    sometimes the metering is "fooled" , i.e. the scene is tricky and whatever the camera thinks is right based on whatever mode you have chosen for metering, that is wrong. other times, we deliberately want to override the "typically correct exposure", you can deliberatley overexpose or underexpose to great effect.

    this is when exposure compensation will come in.

    as for adjustment of shutter/aperture versus just EV adjustment.. that is just different ways to do the same thing.

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    Default Re: Exposure compensation and Aperture/Shttuer settings

    Lets bring it up 1 level ok?


    Lets say for Aperture Priority mode; I select f/1.4 and the cpu selects 1/1000 second.
    This should by right produce the same image as M mode f/1.4 and 1/1000 correct?

    But since EV doesn't work in M mode, if i dial EV - 3.0 in A mode, i can get a dark photo with shallow DoF compared to in M mode. To achieve the same effect in M mode, i've to make the shutter speed 1/1250. Am i correct to say this?

    So what happens if the settings are at
    A: f/1.4 1/4000
    M: f/1.4 1/4000

    If i hit EV -3.0 for A mode to make a darker photo,
    i can't do the same in Manual mode to make a darker photo. Screwed?

    So the bottom line, is EV a electronic change to the sensor or is it mechanical which adjusts the settings of the shot taken. So in Case 2, hitting EV won't help for A mode.
    Last edited by Complex13717421; 3rd September 2009 at 12:20 AM. Reason: Phrasing

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    Moderator catchlights's Avatar
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    Default Re: Exposure compensation and Aperture/Shttuer settings

    Quote Originally Posted by LBL2009 View Post
    What's the difference between using exposure compensation and aperture/shutter settings to achieve over exposed or under exposed picture?

    I can change the aperture or shutter to make the picture over or under exposed in M mode, then when do I use the exposure compensation? Is it for fine tuning?

    Or exposure compensation is mainly used in P, A and S mode since the camera sets the aperture/shutter combination for us?
    AFAIK, exposure compensation does work on Manual exposure mode.

    exposure compensation is simply telling the camera meter to bias towards a one area where the photographer preferred, so when the camera is on P, A and S mode, the exposure compensation will alter the final exposure.

    Where as on Manual exposure mode, exposure compensation is indicate the bias of exposure metering, photographer still have decide what is the exposure setting to use.
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    Default Re: Exposure compensation and Aperture/Shttuer settings

    Thanks all.

    After getting your inputs, I tried exposure compensation on P, S, A and M mode in the last two days and at night.

    This is what I found -

    1. Exposure compensation works in all four modes
    2. It helps to achieve the result I want without changing the aperture/shutter combination set by the camera or by myself
    3. It is most useful in low light situation when a correct exposure may require shutter speed to be set in seconds at widest aperture if flash is not used. Without a tripot, this will be a problem. However, by setting EV to +5 at widest aperture and iso 1600, I could still get a clear picture at 1/50 second at night under room lighting without flash and tripot.

    This is the picture -

    f3.5, 1/50, iso1600, EV+5, WB incandescent

    Last edited by LBL2009; 3rd September 2009 at 10:16 AM.

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    Moderator catchlights's Avatar
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    Default Re: Exposure compensation and Aperture/Shttuer settings

    Quote Originally Posted by LBL2009 View Post
    Thanks all.

    After getting your inputs, I tried exposure compensation on P, S, A and M mode in the last two days and at night.

    This is what I found -

    1. Exposure compensation works in all four modes
    2. It helps to achieve the result I want without changing the aperture/shutter combination set by the camera or by myself
    3. It is most useful in low light situation when a correct exposure may require shutter speed to be set in seconds at widest aperture if flash is not used. Without a tripot, this will be a problem. However, by setting EV to +5 at widest aperture and iso 1600, I could still get a clear picture at 1/50 second at night under room lighting without flash and tripot.

    This is the picture -

    f3.5, 1/50, iso1600, EV+5

    not sure what are you try to achieve in your photo.

    you use Exposure compensation is when you know the camera meter will not give you the correct setting, so you set Exposure compensation to override the camera meter.

    for an example, if you put a person wearing white in front of a white wall, the camera meter will be fool and give underexposed image, and if you place a black cat in front of a black wall, the camera meter will be fool again and give you a overexposed images, this is when you need to override the camera meter by using Exposure compensation.
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    Default Re: Exposure compensation and Aperture/Shttuer settings

    What's the difference between using exposure compensation and aperture/shutter settings to achieve over exposed or under exposed picture?
    Yes, there is a difference. Exposure compensation in auto mode (P, A and S modes) can achieve over exposed or under exposed picture. However aperture/shutter settings cannot achieve over exposed or under exposed picture.

    I can change the aperture or shutter to make the picture over or under exposed in M mode, then when do I use the exposure compensation? Is it for fine tuning?
    Exposure compensation works in auto mode only which is P, A or S mode, and not in manual mode.

    Or exposure compensation is mainly used in P, A and S mode since the camera sets the aperture/shutter combination for us?
    You are absolutely right.
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    Default Re: Exposure compensation and Aperture/Shttuer settings

    Quote Originally Posted by catchlights View Post
    not sure what are you try to achieve in your photo.

    you use Exposure compensation is when you know the camera meter will not give you the correct setting, so you set Exposure compensation to override the camera meter.

    for an example, if you put a person wearing white in front of a white wall, the camera meter will be fool and give underexposed image, and if you place a black cat in front of a black wall, the camera meter will be fool again and give you a overexposed images, this is when you need to override the camera meter by using Exposure compensation.
    Thanks. I learn something from you.

    I was trying to shoot a picture at low light situation without flash and to avoid very low shutter speed called by the camera meter. The picture shown is closer to the 'true' scene. With flash, the picture would be too bright and not showing the 'true' scene. At very low shutter speed without a tripot, my shaky hand gave me a blurred picture. This is a learning shot to see how EV can help me, in this case, a low light situation. Not sure this is the right way to use EV though.

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    Moderator catchlights's Avatar
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    Default Re: Exposure compensation and Aperture/Shttuer settings

    Quote Originally Posted by megaweb View Post
    Yes, there is a difference. Exposure compensation in auto mode (P, A and S modes) can achieve over exposed or under exposed picture. However aperture/shutter settings cannot achieve over exposed or under exposed picture.


    Exposure compensation works in auto mode only which is P, A or S mode, and not in manual mode.


    You are absolutely right.
    Hi megaweb, Nikon and Canon does thing a little bit differently in Exposure compensation, I share what I know about Nikon in post #9.
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    Senior Member Diavonex's Avatar
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    Default Re: Exposure compensation and Aperture/Shttuer settings

    Quote Originally Posted by LBL2009 View Post
    Thanks. I learn something from you.

    I was trying to shoot a picture at low light situation without flash and to avoid very low shutter speed called by the camera meter. The picture shown is closer to the 'true' scene. With flash, the picture would be too bright and not showing the 'true' scene. At very low shutter speed without a tripot, my shaky hand gave me a blurred picture. This is a learning shot to see how EV can help me, in this case, a low light situation. Not sure this is the right way to use EV though.
    You should be playing with your aperture and ISO instead of Exposure Compensation to allow for higher shutter speed.

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    Senior Member Diavonex's Avatar
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    Default Re: Exposure compensation and Aperture/Shttuer settings

    Wider aperture will allow more light to reach sensor.

    Higher ISO will increase sensitivity of sensor.

    A combination of these two (i.e. aperture+ISO) will give you higher shutter speed thus avoiding the use of tripod and camera shake.
    Last edited by Diavonex; 3rd September 2009 at 04:17 PM.

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    Senior Member Diavonex's Avatar
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    Default Re: Exposure compensation and Aperture/Shttuer settings

    EV (Exposure compensation) is generally used in tricky light situation e.g. back lighting or when you want to deliberately over or under-expose a picture when in auto.

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    Default Re: Exposure compensation and Aperture/Shttuer settings

    Quote Originally Posted by Diavonex View Post
    EV (Exposure compensation) is generally used in tricky light situation e.g. back lighting or when you want to deliberately over or under-expose a picture when in auto.
    I see. Thanks.

  19. #19

    Default Re: Exposure compensation and Aperture/Shttuer settings

    This is a good thread.
    It fully support/correct the thoughts that I have regarding this type of question!
    Thanks guys

  20. #20
    Senior Member Diavonex's Avatar
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    Default Re: Exposure compensation and Aperture/Shttuer settings

    LBL2009, Suggest you do not go fully manual until you fully understand the relationship between aperture, shutter speed and ISO. Read this:

    http://photo.net/learn/basic-photo-t...tterspeed-iso/
    Last edited by Diavonex; 3rd September 2009 at 05:42 PM.

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