Aula Fotografia Basica 04 - Abertura do diafragma e a exposição na fotografia?

Video lesson explaining aperture and exposure. We will learn what aperture is, what aperture means in photography, how aperture works, and what "F-STOP" means in photography. Watch! Comment! Share! Aperture and Exposure in Photography What makes a good photo a "good photo"? Many would answer that it's an image with good composition (having an interesting subject) and good EXPOSURE (not being too bright or too dark). Well, to have good exposure, we must control the amount of light that reaches the sensor (too much light will result in very bright photos; too little light will result in dark photos). We achieve this thanks to two controls: the time the shutter allows light to reach the sensor (speed), and the amount of light that passes through the lens, through the aperture. A good analogy would be to think of a glass of water. The amount of water we will have inside the glass will depend on the size of the tap (aperture) and the time we leave it open (shutter speed). The larger the tap, the greater the water flow; the larger the aperture, the more light enters. The longer we leave the tap open, the more water we will have; the longer we leave the shutter open, the more light the sensor will register. This is where aperture and exposure come in. A good exposure is nothing more than adjusting these two factors (aperture and shutter speed) in order to achieve a good image recording, neither too much nor too little light. Another way to understand this is by trying to look directly at the sun. To look directly at it, we have to open our eyelids very slightly, and very quickly, then close them again; otherwise, we would be blinded by the excess light. In a reverse situation, on a dark street, we would have to open our eyes wide, and for a long time, before we could see anything. It's that simple: the larger the "hole" that light enters through the lens, the more light will enter; the smaller the "hole," the less light! When in a bright light situation, we need a "small hole" to let in little light; when in a low light situation, a "large hole" to let in a lot of light! What does F-STOP mean? What is F-STOP? When talking about aperture, we can't speak in terms of "small hole" or "large hole." Imagine you're in a studio, taking photos of a model, and you comment: "Wow! This photo with the large hole will be magnificent!" The model, if she didn't slap you in the face, would run away! And rightfully so! Hehe. In photography, when we refer to the size of the "hole," we use the word APERTURE, or if you want to show that you're a listener of Blood, Sweat and Photography and know a lot about photography, the F-STOP number. The different apertures are known as F-STOPS, or F-NUMBERS, which are arranged in a numerical series, and whose standard sequence is as follows: f/1.4, f/2, f/2.8, f/4, f/5.6, f/8, f/11, f/16, f/22 and f/32. In this scale, each number corresponds to an aperture size, which doubles as we go from one value to another, allowing twice as much light to reach the sensor (if we go to a larger aperture) or half the amount of light (if we go to a smaller aperture). This is where the concept of a lens being a "fast lens," a "bright lens," comes from, due to its small f-stop value (f/1.4... f/1.8... f/2.8...) and consequently being able to let in a large amount of light. If the larger the aperture, the better it is for letting in light and capturing the image on the sensor, why not always use the maximum value? Well, the APERTURE doesn't only control the amount of light that enters the lens. The size of the aperture is also responsible for controlling the DEPTH OF FIELD. Depth of field in photography is the area where we will have sharpness, before and after the object we have in focus. It is by controlling the depth of field that we will have that blurred background, or conversely, have the entire scene in focus. To understand better, watch Video Lesson 033 – What is Depth of Field, where I explain quickly and simply what depth of field is! Here are some links to buy photographic equipment in China that I always use and recommend. Use the links and help me out: DX: http://www.dx.com/en/c/consumer-elect... Aliexpress: http://s.click.aliexpress.com/e/B6MbAu7 Thanks to the DEWILAPI Channel (   / canaldewilapi  ) for creating the subtitles for this video! #photographylessons #basicphotographylessons #photographylessonsforbeginners #photographyforbeginners #photographylessonsforbeginners