Part 3 of the Photographic Golden Triangle

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Presentation transcript:

Part 3 of the Photographic Golden Triangle ISO Part 3 of the Photographic Golden Triangle Copyright © Texas Education Agency, 2014, All rights reserved. Images and other multimedia content used with permission.

Introducing ISO The photographic golden triangle is composed of three different camera settings that adjust how your camera will compose an image when you are shooting in “Manual” mode. Copyright © Texas Education Agency, 2014, All rights reserved. Images and other multimedia content used with permission.

The Photographic Triangle: Part 3 The third portion of the triangle is called ISO. Review: What are the other 2 parts of the Photographic Triangle? Photo provided by the public domain Copyright © Texas Education Agency, 2014, All rights reserved. Images and other multimedia content used with permission.

WHAT IS ISO? ISO is your sensor’s sensitivity to light. ISO stands for International Organization of Standards. High ISO creates a brighter photograph; low ISO creates a darker photograph. Copyright © Texas Education Agency, 2014, All rights reserved. Images and other multimedia content used with permission.

Measuring ISO Cameras have a range of possible ISOs. ISO is measured by whole numbers, starting at either 50 or 100 and doubling from that point. Most current DSLRs top-out at around ISO 3,200, but some have the capability of shooting of ISOs upwards of 204,800. Copyright © Texas Education Agency, 2014, All rights reserved. Images and other multimedia content used with permission.

Photo provided by Will Milne, Denton ISD, Denton, TX Using High ISO Using higher ISOs allows a photographer to correctly expose a photo in dark situations. Photo provided by Will Milne, Denton ISD, Denton, TX Copyright © Texas Education Agency, 2014, All rights reserved. Images and other multimedia content used with permission.

What ISO Does When you turn up your ISO, your camera does two things: It makes your sensor more sensitive to light (brighter picture). It produces more noise in your final image. Therefore, the ISO is often the last element of the photographic triangle to be adjusted and, when possible, should be left at its lowest possible number. Copyright © Texas Education Agency, 2014, All rights reserved. Images and other multimedia content used with permission.

High ISOs A high ISO setting will force your image sensor to be extremely sensitive to light. However, when you turn up the ISO on your camera (ex: 800 to 1600), you are also allowing more digital noise into your photograph. Copyright © Texas Education Agency, 2014, All rights reserved. Images and other multimedia content used with permission.

What is noise Noise is grain that makes your photograph look dirty. The noise might not be noticeable on your LCD screen, but it will be noticeable on your computer. Copyright © Texas Education Agency, 2014, All rights reserved. Images and other multimedia content used with permission.

Photo provided by Will Milne, Denton ISD, Denton, TX Noise Example The image to the right contains noise from shooting at a high ISO. Photo provided by Will Milne, Denton ISD, Denton, TX Copyright © Texas Education Agency, 2014, All rights reserved. Images and other multimedia content used with permission.

When to change ISO Suppose you take a picture and it is underexposed (dark). You have a few options: Open the aperture more. Increase the shutter speed. Use your flash. Or you could bump up your ISO. Copyright © Texas Education Agency, 2014, All rights reserved. Images and other multimedia content used with permission.

When to Change ISO (Continued) In this example, let’s imagine you’re shooting a band at a concert and that you’ve already opened the aperture as wide as possible, you’re shooting handheld at 1/60 (shutter speed) and you can’t use your flash. What can you do to get in more light? Copyright © Texas Education Agency, 2014, All rights reserved. Images and other multimedia content used with permission.

When to Change ISO (Continued) In this case, you would need to use a higher ISO! Photo provided by Will Milne, Denton ISD, Denton, TX Copyright © Texas Education Agency, 2014, All rights reserved. Images and other multimedia content used with permission.

Notes on General ISO Usage You should use an ISO of 100 or 200 when taking photographs in sunlight. If the sky is overcast, then use an ISO within the range of 200 to 400. Copyright © Texas Education Agency, 2014, All rights reserved. Images and other multimedia content used with permission.

Notes on General ISO Usage Night time or in cases of low light you might need to set your digital camera to an ISO upwards of 1600 or more (depending upon your shutter speed) in order to get a good exposure. Photo provided by Will Milne, Denton ISD, Denton, TX Copyright © Texas Education Agency, 2014, All rights reserved. Images and other multimedia content used with permission.

Summary ISO stands for International Organization of Standards. ISO adjusts the sensitivity of your camera’s sensor to light. High ISOs can create lots of digital noise in your image. Unless you are purposefully trying to get noise, your ISO should almost always be the last exposure element to change. Copyright © Texas Education Agency, 2014, All rights reserved. Images and other multimedia content used with permission.