When you're filming in a challenging lighting situation, increasing your ISO or gain can help brighten the image. But pushing it too far can introduce noise and leave your footage looking less clean.

One way to reduce how hard you have to push the ISO is by using a faster lens. A lens with a lower F-stop, such as F1.4, F1.8, F2.0, or F2.8, allows more light into the camera and gives you more flexibility when shooting in darker environments.

Key takeaway: ISO can help when you need more exposure, but a faster lens can give you more light without relying as heavily on ISO or gain.

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