If the exposure for your camera is just a tiny bit off, the skin tone for your shots will be terribly off. You can use an 18% grey card to determine correct exposure, which is useful for setups when you are doing self-portraits or similar projects.
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Digital Cameras How to Set camera exposure by yourself by using an 18% gray card

By getexcellent

Apple's iOS 26 and iPadOS 26 updates are packed with new features, and you can try them before almost everyone else. First, check Gadget Hacks' list of supported iPhone and iPad models, then follow the step-by-step guide to install the iOS/iPadOS 26 beta — no paid developer account required.
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