The Exposure Triangle and Rules of Composition

Rules of Composition

Rule of Thirds

You divide the picture into nine equal parts and position the important objects on lines and intersections.The tree trunk is right on a line and two intersections. This makes for a more interesting picture.

Leading Lines

There should be lines leading your eye through the picture.

The picket fence draws your eye toward the background but so does the shadow of the fence on the ground.


You want a plain and unobtrusive background so the subject doesn't blend in and get lost in the background. You want it to have interest.

The flag is clearly the main point in this picture, but the pale blue sky and few white fluffy clouds create an unobtrusive background that still adds to the picture.

These "rules" will make your pictures more interesting!


You want to make sure your picture has a foreground, middle ground and background to give the picture dimension.The grass is right in the foreground. It even looks a little blurry because it's so close, then the tree is the middle ground. In the very back of the picture you can see the sky as a pretty background. This picture also has a very different point of view compared to most pictures.


You want to have picture that work well together. Colors that are complementary of each other work well.This picture has a lot of blues and greens, yet the color of the ocean and the sky are different and the colors of the palm tree and the grass are different, so there is still visual interest. 

The Exposure Triangle


This determines how sensitive the camera will be to light. You would prefer a lower ISO speed because it decreases picture noise.

This picture has a low ISO because the whole picture is extremely clear and doesn't have much noise.


Controls how much light can enter your camera. The amount of light will effect your depth of field.

This picture has a wide aperture because the background is out of focus and fuzzy compared to the yellow bar in front.

Shutter Speed

Controls how long the camera lens is open for. This will effect your objects motion blur.

I took this with a higher shutter speed because Rachel was moving at a fairly good pace and I didn't want her to be blurry.