Difference Between F-Stop and T-Stop in Lenses

1. F-Stop (Aperture):

• F-stop is a theoretical mathematical measurement that represents the ratio of the lens’s focal length to the diameter of the aperture.

• It indicates the expected amount of light entering the lens.

• It does not account for light loss caused by the lens’s internal elements, such as coatings or glass.

• Commonly used in photography.

2. T-Stop (Transmission Stop):

• T-stop is a practical and accurate measurement of the actual amount of light that reaches the sensor after passing through the lens.

• It considers light loss due to lens elements, coatings, and reflections.

• Primarily used in cinematography, where precise and consistent lighting is crucial.

Key Difference:

• F-stop: A theoretical value for the amount of light entering the lens.

• T-stop: A real-world value of the light that reaches the sensor.

T-stop is more accurate and essential for film production, while F-stop is more commonly used in photography.

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