External flash or hot-shoe

Suppose we want the background and let's just go with flash light exposure.

The first thing I have to do is measure the scene that I photograph using the camera's light meter or an external meter. Remember that before you have to decide what ISO to use.

In our example we will use ISO 200.

Then measure the scene and gives us, for example, F / 8 to 1/125. If we draw the picture without flash, it will turn out properly exposed. Now let's add the flash.

If we use the flash in manual we have to do first is put on the flash ISO we are using.

Then we put the diaphragm that we put in the camera (in this case f / 8). And then we have to look at the table to see how far we have to put the flash on the picture if we are using f / 8.

In the picture you can see the flash as I put on the flash that was to be used in Manual (red box). In the green box you can see I put ISO 200. And in the blue box may notice that the distance scale is in meters and feet.

If you look at the aperture f / 8 vain to see the picture I want to do the flash has to be 8 meters from the object.

In this way we will ensure that both the background and the object or subject that the lights flash out equally exposed.

If we put the flash closer to the main object of this is going to go above and if we put the flash farther exposed sub​​'s out.

If we are to use the flash to Auto the first we have to put the ISO on the camera. Then we have to put in the flash diaphragm'll use in this case F / 8.

In the photo above you can see in the blue box that I put ISO 200. But now instead of being in Manual (M), I put the orange arrow in one of the 5 options that I get this flash to use Automatic. I put it at f / 8 (red box).

This way I can get the photo and both the background and the main subject will be exposed correctly.

The advantage of using the Auto mode is for me I can move the flash closer or farther away, and the flash will fire the amount of light required to illuminate the subject correctly using f / 8 on the camera.

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