WHAT IS ISO? A CAMERA’S SENSITIVITY TO LIGHT EXPLAINED, AND HOW TO USE IT

WHAT IS ISO? A CAMERA’S SENSITIVITY TO LIGHT EXPLAINED, AND HOW TO USE IT

By Drew
Prindle — August
31, 2013

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If you’re relatively new to digital photography,
making sense of all the lingo and acronyms can be a rather daunting task, but it’s also key to knowing your way around your camera and taking excellent photos. One of the most confusing settings on your shooter is undoubtedly ISO, so we’ve put together this
dead-simple explanation to help you master it in just a few minutes. Here’s what you need to know.

First, let’s break down the acronym. ISO is short for International Standards Organization – the main governing body that standardizes sensitivity ratings for camera sensors. It’s a a term that was carried over from film. When
you change your ISO setting, you’re adjusting your camera’s sensitivity to light. ISO settings can be anywhere from 24 to 6,400 (or higher), and these numbers have a direct relationship with the device’s sensitivity, so a lower setting makes it less
sensitive and a high setting makes it more so. Along
with shutter speed and aperture, ISO is one of the three factors that determine your picture’s exposure. Finding the right balance between these three settings is key to getting the perfect shot.

Finding the right ISO setting

First of all, you should know that a higher ISO typically translates to a noisy or “grainy” image,
so as a general rule you want to use the lowest setting possible for your photos. Check out the picture below to see the difference it can make.



A lower ISO will usually produce more color-accurate, aesthetically pleasing images, but there are situations where a higher ISO is desirable. The proper ISO setting really depends on the level of lighting you’re shooting in and the visual effect you’re going
for, so rather than relying on one over-arching rule, consult this list of tips:

If your subject is moving and you’re trying
freeze the motion for a still, you’ll likely need a higher ISOsetting to compensate
for the high shutter speed and ensure your image gets enough light

If you’re going
for more of a vintage aesthetic and want to add a little bit of grain to your photos, don’t be afraid to bump
up the ISO a few notches

If you’re using
a tripod to stabilize your camera you can usually get away with a slower shutter speed, which in turn allows you to use a lower
ISO

If you’re shooting
an image that doesn’t require a large depth-of-field, you can increase the camera’s aperture (thus allowing more light into the lens) and use a lower
ISO

If you’re shooting
with artificial light (i.e., using a flash) you can typically get away with a lower ISOsetting

You’ll probably need to experiment a bit until you hit the sweet spot, but while you tinker with settings, keep the following in mind:

Never trust your camera’s display. Don’t assume that your picture
will turn out just because the tiny 2-inch preview looks adequate. Your shots almost always look different on your computer, and you probably won’t be able to spot noise on your camrea’s small, low-resolution display. For this reason, we highly recommend that
you zoom in a bit to check your images for grain.
There’s nothing worse than taking a bunch of seemingly great shots only to discover they’re noisy and speckled when you upload them to your PC.

Still confused by ISO? Feel free to leave your questions in the comments below and we’ll see if we
can help you out!

Read more: http://www.digitaltrends.com/photography/what-is-iso-camera-settings-explained/#ixzz2t4Nybrqx

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