The aperture of the lens controls the amount of light that passes through on its way to the camera's sensor or film plane. A camera's aperture is also commonly called its f-stop, though 'f-stop' technically refers to the diameter of the opening created by internal adjustable blades, rather than the entire mechanism.
From the very first time we pick up our cameras, we discover the importance of focusing on the main subject. It’s one of those intuitive bedrock foundations of Photo 101 and it becomes ingrained in our brains as an essential rule that we live by for the rest of our lives. Specifically, we learn that when shooting people or animals, we generally want to land the point of sharp focus right on the eyes.
The trend in cameras for many years has been towards smaller sizes. Small is good when you want a camera you can carry at all times in a pocket or purse. But, when it comes to image quality, in almost every case bigger is better.
Consider detail resolution. It’s often expressed in megapixels or numbers like 1920 x 1080. There doesn’t seem to be any particular size associated with either; they’re just numbers. A camera with a 4/3-inch-format sensor and one with a 1/3-inch-format sensor seem to have the same resolution if they have the same numbers.
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