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There are three components to Camera Exposure:
There are three components to Camera Exposure:
1: Aperture
1: Aperture
2: Shutter Speed
2: Shutter Speed
3: ISO
3: ISO
1 . Aperture: Lens Openning aka, f stop
1 . Aperture: Lens Openning aka, f stop
Aperture Controls Depth of Field
Aperture Controls Depth of Field
We say, "use a large Aperture." What we are referring to is the size of lens opening (the f-stop). 1.4, 2.4, 4 are considered large Apertures, they let in the most light and give you the Shallowest Depth of Field. In the final image, you will see a background that is blurred.
If you use a small Aperture, f 16 22, you will see clarity throughout the photograph, this is a Large/Deep Depth of Field
2. Shutter Speed: How long the image is allowed to expose the sensor.
2. Shutter Speed: How long the image is allowed to expose the sensor.
Shutter Speed controls how long the sensor is exposed to light. The longer the exposure time the more light will enter the lens. Shutter Speed controls motion in an image. It can Freeze or Blur motion. When you handhold a camera any shutter speed longer than 1/15 of a second will give you blur, not often in a good way either.
3. ISO: Image sensor and amplification
3. ISO: Image sensor and amplification
An image sensor is a densely packed array of photosensors that detect light. Each photosensor, or pixel, will accumulate an electrical charge when exposed to light. The strength of this charge is proportional to the intensity of light at each pixel’s location. Immediately after exposure, the electrical current generated by each photosensor passes through a signal amplifier and continues towards the analogue-to-digital converter, which digitizes the signal, making it readable by the camera’s microprocessor.
Unlike the aperture and shutter, which are physical mechanisms, the ISO describes an electronic function that simulates changes to exposure. ISO is not a variable of exposure because it doesn’t affect the amount of light the image sensor receives. Instead, ISO settings determine how brightly the camera renders a picture given the exposure you have set using the aperture and shutter speed. Thus, ISO lets you change picture brightness without further adjusting your aperture or shutter settings, or, if possible, changing subject brightness by adding or subtracting light from the scene. -https://exposuretherapy.ca/photography-guide/exposure-and-iso/
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