A lens is a piece of glass or other transparent substance with curved sides for concentrating or dispersing light rays. A sensor is a solid state devive which captures light required to form a digital image. A large sensor is necessary for advertisements or studio based shoots. They can also cope better when shooting in dark situations. A smaller sensor is necessary and good for wildlife and sport photography, due to the crop factor. Cameras with smaller sensors can take more images due to their frames per second.
15 mm focal length
55 mm focal length
The images above show two images I took of the same subject and composition but using different focal lengths. The first one was 15 mm and the second was 55 mm.
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