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What Is ISO?
Kamera Express
What is ISO? – Discover how to take control of light sensitivity!
ISO is one of the most important settings on your camera and plays a major role in how your photos look, especially in low-light situations. With ISO, you control the light sensitivity of your sensor, which directly affects the brightness of your images. Do bear in mind, however, that a higher ISO can introduce more noise into your photos. Here you'll learn exactly what ISO is, how it works in combination with shutter speed and aperture, and how to choose the best ISO settings for every situation. With this knowledge, you'll capture better-exposed photos, even in challenging lighting conditions!
The basics: what is the ISO value?
ISO is a setting on your camera that determines how sensitive the sensor is to light. The higher the ISO value, the more sensitive the sensor becomes, meaning you can capture more light in dark conditions without using a longer shutter speed or wider aperture. The ISO value typically ranges from 100 (low sensitivity) to 6,400 or higher (high sensitivity), depending on the camera. Low ISO values produce bright, sharp photos in good lighting conditions, while higher ISO values are useful in low-light situations, such as night photography or indoor shooting.
How does ISO affect your images?
ISO has a direct impact on both the brightness and the quality of your photos. At a low ISO value, you get the best image quality with minimal noise, but you need more light to achieve a well-exposed photo. At a higher ISO value, the camera becomes more sensitive to light, giving you better exposure in dark situations, but this often comes with an increase in noise (grainy effects) in your image. Finding the right balance between sufficient light and minimal noise is therefore the key challenge when working with ISO.
Tips for working with ISO
Tip 1: Start with a low ISO
When shooting outdoors in daylight or in well-lit indoor spaces, use a low ISO value such as ISO 100 or 200. This produces the sharpest and cleanest images with minimal noise.
Tip 2: Combine ISO with shutter speed and aperture
ISO is part of the exposure triangle along with shutter speed and aperture. By increasing the ISO, you can use a faster shutter speed or smaller aperture, for example, which can be useful when photographing fast-moving action or achieving a greater depth of field.
Tip 3: Increase your ISO when needed
In dark conditions, such as indoors or in the evening, you can increase the ISO value to still capture sufficient light without having to use a slow shutter speed. Try values such as ISO 800 or 1,600 to avoid underexposed photos.
Tip 4: Watch out for noise at high ISO
Although a high ISO can help you in low-light situations, it can also introduce noise. Test your camera to find out from which ISO value noise becomes visible, and avoid extremely high values where possible, unless it's truly necessary.
Tip 5: Make use of Auto ISO
If you frequently shoot in changing lighting conditions, the Auto ISO setting can be very useful. This allows the camera to automatically adjust the ISO value based on the available light, so you can focus on other aspects of your composition.
Tip 6: Reduce noise in post-production
If you've taken photos at a high ISO value and noise is visible, you can improve the image quality in post-production. Editing software offers noise reduction tools that allow you to reduce unwanted grain without losing too much detail.
Short & Sharp: ISO
In our video "Everything about ISO in 2 minutes" you'll get a quick and clear explanation of what ISO is and how it affects your photos. This short summary is perfect for anyone who wants to quickly grasp the basics of ISO without diving into too many technical details. The video provides examples of different ISO values and shows how they work in various lighting conditions, from bright sunny days to dark indoor shots. Watch the video and discover how to always capture well-exposed photos with the right ISO settings!
Which ISO do you need for your photos?
Choosing the right ISO value is essential for capturing well-exposed photos, especially in varying lighting conditions and across different types of photography. Depending on what you're photographing and the amount of available light, the ISO value can range from low values such as 100 to higher values such as 3,200. Here are some guidelines for choosing the right ISO setting for different types of photography, helping you find the balance between sufficient light and minimal noise.
Wildlife photography:
In wildlife photography, you're often dependent on natural light and need to react quickly to moving animals. During the day, in bright sunlight, you can use a low ISO value such as ISO 100–400. In lower-light situations, such as during dusk, you can increase the ISO to 800 or even 1,600 to capture sufficient light without your shutter speed becoming too slow.
Landscape photography:
For landscape photography, you want to capture as much detail as possible with minimal noise. A low ISO value such as ISO 100 or 200 is therefore ideal. Since you'll often be working with a tripod and can use longer shutter speeds, there's generally no reason to increase the ISO, unless you're shooting in extremely dark conditions.
Street photography:
Street photography often requires flexibility, as you'll be dealing with changing lighting conditions. During the day you can work with ISO 100–400, but when shooting in the evening or indoors, it can be useful to increase the ISO to 800 or even 1,600, depending on the available light. This helps you avoid blurry images caused by motion blur.
Night photography:
In night photography, you'll almost always need a higher ISO value to gather sufficient light. Start with ISO 1,600, but if you find that not enough light is coming in, you can increase further to ISO 3,200. Do bear in mind that higher ISO values can introduce more noise, but this is often the only way to shoot without a flash.
Wedding photography:
In wedding photography, you'll often be working with varying light, from well-lit outdoor venues to dark indoor spaces or churches. During the day you can use ISO 100–400, but during the ceremony or reception you can increase the ISO to 800–1,600 to capture the atmosphere without relying on flash, which can disrupt the natural ambience.
Event photography:
At events and concerts, you'll typically be working in low-light situations with a lot of movement. A high ISO value such as ISO 1,600 or 3,200 is often necessary here to capture sufficient light and freeze movement sharply. Although this can introduce more noise, you can often reduce a large part of it in post-production.
Sports photography:
In sports photography, speed is crucial. You'll want a fast shutter speed to capture quick movements sharply, so a higher ISO value is often needed. During the day you can use ISO 400–800, while for indoor or evening events you can go up to ISO 1,600 or 3,200 to capture the action clearly without motion blur.
Portrait photography:
For portrait photography, you want a good balance between brightness and detail. In well-lit situations such as outdoors on a sunny day, ISO 100–200 is ideal. For indoor shots or in lower-light situations, such as under artificial light, you can increase the ISO to 400–800, allowing you to work without flash while still having enough light to capture your subject clearly and sharply.
Travel photography:
Travel photography can range from bright sunny days to dark indoor shots in museums or evenings in cities. During the day you can use ISO 100–400, while at dusk or indoors you may need to switch to ISO 800–1,600 to get a well-exposed photo without too much noise.
What you need to know about editing photos
Now that you have a good understanding of how to take your photos and which settings are important, editing your images is the next step to make them truly shine. Post-production can help you correct small mistakes, optimise the exposure, and adjust the colours to your liking. Want to find out how to take your photos to the next level with the right editing techniques? Read the article below!
