Name: EF 17-40mm f/4L USM
Brand: Canon
SKU: 433618
Rating: 4.3 (9 reviews)

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Canon

The EF 17-40 mm 1:4L USM is a lightweight ultra-wide-angle zoom lens. It is particularly suitable for digital EOS SLR cameras. It offers excellent imaging performance across the entire focal length range. It features a very high autofocus speed for its class. Effectively sealed against dust and moisture ingress. Minimum focusing distance of 28 cm at all focal lengths.

Actual product image Canon EF 17-40mm f/4L USM (Canon EF, full size)

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Bayonet lens mount

A lens mount is an interface — mechanical and often also electrical — between a photographic camera body and a lens. It is confined to cameras where the body allows interchangeable lenses, most usually the single lens reflex type or any movie camera of 16 mm or higher gauge. Lens mounts are also used to connect optical components in instrumentation that may not involve a camera, such as the modular components used in optical laboratory prototyping which join via C-mount or T-mount elements.

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