1. How does the diameter of the aperture affect the focus of the image?
2.What is an F-stop? How are they calculated?
3. What is a T-stop? How is it different from an F-stop?
A smaller aperture results in a sharper image by restricting the angle of light traveling through the system. However, this can cause less light to be exposed onto the sensor, which can be problematic in a darker situation. The F-number, or the F-stop, can be calculated by dividing the focal length by the diameter of the aperture. In order to double the amount of light that hits the sensor, the diameter must be increased by dividing the Fstop by 1.4. It is important to note that the different amount of light may hit the screen even wit the the same F stop value depending on the structure of the camera. In this case, cinematographers will use a scale known as the T-stop. T-stops are numbers that are corrected according to the F-stops numbers. This way, the same T-stops will have the same exposure levels even on lenses with different focal lengths.
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