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Understanding camera lens can help add more creative control to digital photography. Choosing the right lens for the task can become a complex trade-off between cost, size, weight, lens speed and image quality. This tutorial aims to improve understanding by camera lens roviding an introductory overview of concepts relating to image quality, focal length, perspective, prime vs. camera lens zoom lenses and aperture or f-number.

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Tamron is a camera lens leading manufacturer of digital camera lenses for photographic, CCTV, industrial, laboratory, video, digital and scientific camera lens applications. Tamron USA, Inc., the US sales subsidiary of optics manufacturer Tamron Co., Ltd., is comprised of 2 major divisions: Tamron lenses for camera lens DSLR and conventional cameras and Tamron Lenses for CCTV Security suspension seats and factory automation applications.

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Most photographic lenses can be thought of as modified pinhole lenses. A pinhole lens would be excellent except for a few serious limitations. They are limited in their resolution because, while geometric optics says that making the pinhole smaller camera lens improves resolution, this also reduces light; furthermore, diffraction limits the effectiveness of shrinking the hole. Most photographic lenses can be thought of as an answer to the question "how can we modify a pinhole lens to camera lens admit more light and give higher resolution?" A first step is to put a simple convex lens at the pinhole with a focal length equal to the distance to the film plane camera lens (assuming the camera will take pictures of distant objects). This allows us to open up the pinhole a bit. The geometry is almost the same as with a simple pinhole lens, but rather than being illuminated by camera lens single rays of light, each image point is illuminated by a focused "pencil" of light rays. Standing out in the world, you would see the small hole. This image is known as the entrance pupil: all rays of light leaving an object point that enters this pupil will be focused to the same point on the film. If one were inside the camera, one would see the lens acting as a projector. The image of aperture is the exit pupil

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