ISO Explained

23 Dec 2025 · 1 min

Watch on YouTube

0:59

In this instructional segment, the speaker defines ISO as the sensor's sensitivity to light, explaining that higher ISO values make the sensor more sensitive, allowing brighter images in low‑light conditions. The speaker acknowledges the downsides of high ISO—noise, grain, reduced contrast and color saturation—but emphasizes that it enables faster shutter speeds or smaller apertures, which can be essential for capturing sharp photos when light is limited. The segment also notes that modern noise‑reduction software can mitigate the visual impact of high ISO, encouraging photographers not to fear using higher ISO settings when needed.

Chapters

Understanding how to use your ISO settings can save your photos or absolutely ruin them. So let's talk about it. ISO is our measure of the sensitivity of our sensor. The higher that number, the more sensitive our sensor is. And it's a little hard to wrap our head around this. What that essentially means is that if it's darker out, we use a higher number and our photo is going to appear brighter even though there's less light available to us. But if you want to understand and improve your photography, it's essential that you learn how to use use ISO. Don't be afraid to use a higher ISO. Yes, your pictures are going to be noisy, they're going to be grainy, they're going to lose contrast and color saturation. However, they let you use a faster shutter speed or a smaller aperture, which means high ISO may be your only choice to actually getting a clear photo. And besides that, we have a lot of programs today that can bring that noise down and make your pictures look amazing.