Google trend - Lens FC

Lens FC, also known as Lens Focal Length Conversion, is a term used in photography to describe the effect of using lenses with different focal lengths on a camera's field of view. Focal length is a fundamental property of a lens that determines its angle of view, magnification, and depth of field.

The focal length of a lens is measured in millimeters and is the distance between the lens and the image sensor when the subject is in focus. A lens with a shorter focal length has a wider angle of view, allowing you to capture more of the scene in the frame. On the other hand, a lens with a longer focal length has a narrower angle of view, resulting in a closer and more magnified image.

Lens FC comes into play when you use lenses with different focal lengths on a camera with a fixed sensor size. The field of view of a lens is determined by its focal length and the sensor size of the camera. For example, a lens with a focal length of 50mm on a full-frame camera will have a certain angle of view, while the same lens on a camera with a smaller APS-C sensor will have a narrower angle of view.

To understand Lens FC, it is important to consider the concept of the "crop factor." The crop factor is the ratio of the diagonal of a full-frame sensor to the diagonal of the sensor in question. For example, an APS-C sensor has a crop factor of approximately 5x, meaning that a lens with a focal length of 50mm on an APS-C camera will have an effective focal length of 75mm (50mm x 1.5) in terms of its angle of view compared to a full-frame camera.

Lens FC is particularly relevant when switching between different camera systems or when using lenses designed for different sensor sizes. For instance, if you are accustomed to shooting with a full-frame camera and a 50mm lens, but then switch to an APS-C camera, you will need to take into account the crop factor and adjust your shooting style accordingly. The same applies when using lenses designed for micro four-thirds or other sensor sizes.

Understanding Lens FC is crucial for photographers because it affects the composition and framing of their images. When using a lens with a longer focal length, the subject appears closer and more magnified, which can be advantageous for portraits or wildlife photography. Conversely, a wider-angle lens with a shorter focal length is ideal for capturing landscapes or group shots where you want to include more of the scene in the frame.

In summary, Lens FC refers to the adjustment of focal length and field of view when using lenses with different focal lengths on cameras with fixed sensor sizes. It is essential for photographers to understand the concept of crop factor and how it affects their images' composition and framing. By considering Lens FC, photographers can make informed decisions about lens selection and achieve the desired results in their photography.