A camera's aperture lets you control how much light reaches the lens. For a brighter photo, you want to let in more light; for a darker one, you'd ideally let in less. This system is similar to the pupils of your eyes, which constrict when the light is too bright and dilate when you suddenly go from bright sunshine to a dark room.
How variable aperture changes photos and videos
The iPhone 18 Pro has three rear cameras, but only the main camera offers a variable aperture. It's a 48-megapixel sensor with four aperture f-numbers supported. You can pick an aperture value from f/1.48, f/1.8, f/2.8, and f/4.0m, which should make it significantly easier to get the exposure just right in difficult lighting conditions. You'll also be able to take better photos in low light and try a few additional creative shots with your iPhone 18 Pro. Having a variable aperture is great for controlling depth of field, so you can easily blur the background or keep it in sharp focus when you take photos.
If you're thinking that your iPhone already does these things, you're sort of right. But it's worth remembering that up until now, iPhones had to rely on software to perform these tasks, which gets the job done, but the results aren't always exactly what you'd visualize. Having hardware control over aperture gives you greater control over the output and brings the final result much closer to what you visualized. In theory, variable aperture should make the iPhone 18 Pro better for astrophotography, too, but until all of these tasks are tested, it's hard to say how much impact the new feature will have.
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