Named after its inventor Augustin-Jean Fresnel, the magnifier was originally used in the construction of lighthouses due to its thin and lightweight design. It has been called “the invention that saved a million ships”.

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Focal length is the distance from the focusing plane (where the camera’s sensor is) to the rear nodal point of the lens, when focused at infinity. This is a property of the lens, which determines the angle of view as well as the perspective.

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The Fresnel lens is a compact lens made of a series of concentric rings of simple lenses. Each ring focuses light towards the centre of the rings. The result means the Fresnel lens can be made much thinner than comparable lenses but the design does reduce the focus or clarity of the image projected through it.

Effective working distance is the distance from the outer edge of the lens to the subject. This term has a meaning when the lens’ front element resides behind the outer edge of the lens, for example the Sigma 105/2.8 EX Macro and many other macro lenses.

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It is a lightweight and durable lens. Made of PVC, the thin yet sturdy Fresnel Lens Magnifier is ideal for those situations when the enlargement of an image is required.

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Minimum focusing distance is the shortest distance from the focusing plane to the subject, at which it can be sharply rendered, i.e. “in focus”. If we move the camera closer to the subject, we won’t be able to focus on it. Usually in lens properties, lens makers indicate the minimum focusing distance, instead of the working distance, which is far more important in practice.

Fresnel Lens is now an important part of the automotive, medical, electrical, aeronautical, entertainment, photography, and medical fields. It also great in the classroom to teach about lenses and optics due to its large size.

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It was originally developed by French scientist Augustin-Jean Fresnel who studied light and optics in the 1800s.  Whilst image quality is reduced, light is refracted (bent) to concentrate the light into a relatively narrow beam. For this reason, the Fresnel lens was often used in the construction of lighthouses.