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Digital SLR Basics
Transcript of Digital SLR Basics
The size of the lens opening and how much light is let through is controlled by the aperture.
The size of the hole depends on what you set your aperture to. The larger the hole is the more light gets in and the smaller the hole the less light goes through.
Camera lenses are considered the "eye" of the camera. It also works a lot like the human eye, allowing it to see the outside world. The light passes through the lens and focuses on the sensor of a digital camera, in which the light carries the images through which you and the camera both see.
Lenses have several elements inside this metal barrel, which are all simple lenses themselves.
They are a piece of carefully shaped, polished glass and those are the elements in the lens that focus the image in the sensor or film.
The zoom lens is used by manually turning a ring which is located on the barrel of the lens.
While moving the zoom function, inside of the camera, a group of the glass lenses will move either closer to or further away from each other, causing the zoom function.
Focal lengths are an important part of the Zoom lens. It refers to the distance from the CCD to the optical glass inside the lens. This is what determines how far the lens can zoom.
The ISO determines how sensitive a camera is to incoming light.
A lower ISO is usually used because it is less sensitive to light and the finer the grain.
Common ISO speeds are 100, 200, 400 and 800
Higher ISO speeds are generally used in darker situations to get faster shutter speeds needed to gain enough light, although the image becomes grainier.
The shutter speed is the length of time the shutter is open so light can pass through the lens to the sensor.
When the shutter is open for a shorter amount of time, your image turns out sharper because it closes quicker but it doesn't let in as much light.
“ Which of my photographs is my favorite? The one I’m going to take tomorrow. – Imogen Cunningham