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Explore Your Camera’s ISO Settings

Homework Assignment No. 1: Rule of Thirds and ISO Settings

RuleOfThirdsByDannySchweersThe first homework assignment I give students is to take a series of photos in Program Mode to explore ISO settings and to use the Rule of Thirds. I also ask them to tell me the name of a photographer whose work they admire.

Rule Of Thirds

If you compose your image using the Rule of Thirds, vertical lines are placed one-third to the right or left, or, horizontal lines are placed one-third up or down. In short, the Rule of Thirds says to compose your image so that items are not dead center. Don’t use the camera like a pistol! You are not shooting a bullseye; you are placing an image within a frame.

In general, the Rule of Thirds is useful in compositions with strong horizontal and vertical elements. For example, paintings by Edward Hopper often have strong verticals and horizontals, as did abstract painters in the Color Field and other artistic movements.

Do you see how I used the Rule of Thirds in the photo above right? The face is on the 1/3 line to the left, and the eyes are aligned with the 1/3 line to the top. You can consider the four spots where the lines cross to be the “sweet spots” of the image rectangle. Even if there are no vertical or horizontal lines in the viewfinder, you can still move your camera so that the most important element in the scene is centered at one of these sweet spots.

To learn more about the Rule of Thirds, do an Internet search for “Rule of Thirds” and look at the images. Also, you might visit http://digital-photography-school.com/rule-of-thirds/

RULE OF THIRDS: The ivy is one-third over from the left. The top of the fence is one-third down from the top.

ISO: Varying Your Camera’s Sensitivity To Light

In general, ISO can be adjusted manually in the following shooting modes: P, Tv or S, Av or A, and M. In many cameras, ISO cannot be set by the user in the Green Automatic mode. In that mode, everything stays automatic, including ISO.

NIKON USERS: In some Nikons, the Auto ISO has to be turned off and only then can the ISO be adjusted, two separate operations.

To test a camera’s ISO settings, start with the lowest ISO and double it each shot up to the maximum ISO setting. Then look at the images to see how the image quality gets worse as the noise increases. QUESTION: What is the highest ISO setting that still produces acceptable results? If your camera can go to ISO 25,600 but you do not like the looks of images taken above 3,200, then  ISO 3,200 is your working limit.

Increasing the ISO makes the camera’s sensor more sensitive to light. That means the camera can capture images in darker places or at faster shutter speeds or smaller apertures. But noise increases as ISO increases. That means quality decreases, sometimes to the point that photos are as much noise as they are image.

Click here to see all the posts in Danny’s “Take Better Photos” blog.

100% closeups of photos taken with a DxO One camera at varying ISO settings, pixel-for-pixel.

Below are small portions of the photo of the ivy on the fence. These are pixel-for-pixel, 100%, of photos taken in September, 2018, with a DxO camera. As ISO increases, the shutter speeds get faster, making the images sharper as camera shake is eliminated. But then, as ISO increases further, the noise becomes ugly.

ISO 100
ISO 200
ISO 400
ISO 800
ISO 1,600
ISO 3,200 Noise is easily seen, especially in shadows.
ISO 6,400 Noise is very apparent, especially in shadow areas.
ISO 12,800. Noise is everywhere!

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Danny Schweers teaches photography lessons in and around Wilmington, Delaware. To learn more, visit his Contact Us page on this website.

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