Hi,
As Wieland explained, Auto Exposure Lock is one way.
Ev adjustment and HDR are two others.
Then there is spot metering as well.
Let me explain a little more on this subject.
In general the camera will measure the entire field of view and adjust it's exposure to the total average.
There are a number of situations where that does not work for you:
1. Back light.
You are facing the light, the total light taken in by the camera in average is high.
The exposure will be set to short, giving dark subjects.
You get sillouette like subjects.
Sometimes, this is just what you want.
2. The total dynamic range of the picture is too wide for the camera to handle.
The field of view contains both light and dark areas.
Te picture holds both dark shadows without details and blown out light areas without any details.
3. Low light.
In dark situations, you may want to capture the atmosphere of the scene, however your camera compensates for the low light by taking a very long exposure.
The camera over exposes. Your picture becomes too bright. Loosing the effect.
So, what tools do you have available for handling these situation?
You have several.... 1. Back light: - Spot metering.
Put the camera in spot metering, meter the subject.
If the subject is not in the middle of the picture, use AEL (see below)
Take the photo. - Auto Exposure Lock. (AEL button)
Compose (zoom in, point the camera) so that you "only" see the subject in the view finder.
Press the AEL button until the beep (there is a * on the display now)
Recompose as you wish, focus, take the photo. - Flash.
You can use the on camera or a loose flash to "fill in" the picture.
By adding light from the camera on to the subject, you will see the subject *and* the background clearly.
This only works on short distances (few meters) a flash can cover. - Compensate manually.
Overexpose manually using the Ev compensation button.
Press the [+/-] button while turning the rear wheel to add +1 Ev up till +2 Ev.
Now the camera will overexpose by 1 or 2 stops on whatever amount of light it measures.
Remember, if you put your camera in digital preview mode, you can always take a test shot by clockwise turning the power button and see what the exposure is doing for you. 2. Dynamic range is to small: - Use HDR (High Dynamic Range) pictures.
Here only HDR is the only sort of real solution.
There are 2 options:
a. In camera (read the manual).
b. Using software (Photoshop, Photomatix, others) and exposure bracketing.
The general idea behind HDR is to take multiple pictures, from underexposed to over exposed, combine them into one with all details.
HDR is a topic with many tweaking options, except when you use the in camera function.
There is a lot to read on this subject. - Make a deliberate choice on what subject is to be exposed right.
Use the techniques mentioned under Back Light, directed at your subject of choice. 3. Low light.
Here the same techniques as in Back Light can be applied. See above.
The only thing to consider here is to avoid Auto ISO.
If the camera encounters low light in Auto ISO mode, it generally will max the ISO value in the set range.
This will increase the noise level in the dark areas, of which you may intentionally have a lot.
So, select the ISO value manually to ISO 100 - 400 max.
Use the ISO button on top of the camera and the rear wheel to select the ISO value of your choice.
You can select Auto ISO again by pressing the ISO button and the Green button at the same time.
Hope this helps you....
- Bert
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