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The effective focal length of a lens is the distance from the lens to the image sensor when the subject is in focus. The difference in effective focal length between two lenses affects the magnification and field of view of the images they produce. A longer focal length lens will have a narrower field of view and higher magnification, resulting in more detailed and compressed images. On the other hand, a shorter focal length lens will have a wider field of view and lower magnification, capturing more of the scene but with less detail. Ultimately, the choice of focal length depends on the desired composition and perspective of the image.
The effective focal length of an 85mm lens on a crop sensor camera is approximately 136mm.
A zoom lens you can go from one focal length to another such as 70-200mm and a fixed is one focal length such as 50mm
The effective focal length formula in photography is calculated by adding the reciprocal of the focal lengths of each optical element in the system. This formula helps determine the combined focal length of a lens and any additional optical elements.
The lens focal length formula used to calculate the focal length of a camera lens is: Focal Length (Distance between lens and image sensor) / (1 (Distance between lens and object) / (Distance between lens and object))
In photography, the relationship between focal length and magnification is that a longer focal length typically results in higher magnification. This means that objects appear larger in the frame when using a longer focal length lens compared to a shorter focal length lens.
In photography, the relationship between focal length and field of view is that a shorter focal length results in a wider field of view, while a longer focal length narrows the field of view.
Zoom in photography refers to the ability to change the focal length of a lens to make the subject appear closer or farther away. Focal length, on the other hand, is the distance between the lens and the image sensor, which determines the angle of view and magnification of the image. In simpler terms, zoom is the act of adjusting the focal length to change the size of the subject in the frame.
The relationship between focal length and angle of view is such that the shorter the focal length, the wider the angle of view. Shorter focal lengths encompass more of the scene in the frame, leading to a wider angle of view.
zooming in decreases the focal length
A telephoto lens has a fixed focal length, providing a specific level of magnification, while a zoom lens can adjust its focal length to vary the level of magnification.
In a focal length calculator, the field of view (FOV) and focal length have an inverse relationship. This means that as the focal length increases, the field of view decreases, and vice versa.