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The general trademark of a manufacturer by which the consumer knows its products. A manufacturer can have multiple brand names. Some manufacturers license their brand names to other producers.
Product name:
Product name is a brand's identification of a product, often a model name, but not totally unique as it can include some product variants. Product name is a key part of the Icecat product title on a product data-sheet.
EF 17-40mm f/4.0L USM
Product code :
The brand's unique identifier for a product. Multiple product codes can be mapped to one mother product data-sheet if the specifications are identical. We map away wrong codes or sometimes logistic variants.
8806A007 show
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EAN/UPC code :
European Article Number (EAN) and Universal Product Code (UPC) are better known as the barcode on a product's packaging to uniquely identify a product in a shop or logistic process. One product data-sheet can have multiple barcodes depending on logistic variations such as packaging or country.
Category :
The light-gathering device of a camera, typically containing a group of compound lenses. Lenses come in different lengths, with very long lens used for long-distance photography.
camera lenses
Data-sheet quality: created/standardized by Icecat
The quality of the product data-sheet can be on several levels:
only logistic data imported: we have only basic data imported from a supplier, a data-sheet is not yet created by an editor.
created by Canon: a data-sheet is imported from an official source from a manufacturer. But the data-sheet is not yet standardized by an Icecat editor.
created/standardized by Icecat: the data-sheet is created or standardized by an Icecat editor.
Included since: 01 Nov 2006
The date Icecat noticed for the first time that this product was included in the price list of a channel partner
Info modified on: 14 Sep 2016 16:30:20
The date of the most recent change of this product data-sheet in Icecat.
Product views: 125106
This statistic is based on the 61815 using ecommerce sites (eshops, distributors, comparison sites, ecommerce ASPs, purchase systems, etc) downloading this Icecat data-sheet since 01-11-06 Only sponsoring brands are included in the free Open Icecat content distribution as used by 60174 free Open Icecat users .
Long product name Canon EF 17-40mm f/4.0L USM:
The short editorial description of Canon EF 17-40mm f/4.0L USM
EF 17-40mm f/4.0L USM

Marketing text Canon EF 17-40mm f/4.0L USM

The official marketing text of Canon EF 17-40mm f/4.0L USM as supplied by the manufacturer
The EF17-40mm f/4L USM is a lightweight ultra wide angle Canon EF zoom lens. It is especially well suited for use with digital EOS SLR cameras with a focal length conversion factor higher than 1.


-Superb optical performance throughout the zoom range.
-Fastest AF speed within its class (same as the EF16-35 f/2.8L USM).
-Highly dust and moisture resistant.
-28cm minimum focusing distance at all focal lengths *as of January 2003.

Ultra wide lens for analogue EOS SLR cameras
The EF17-40mm f/4L USM is an ultra wide angle Canon EF zoom lens meant for professional and high amateur SLR EOS camera users.

Standard zoom lens for digital EOS SLR cameras
While it is an excellent lens when used with an analogue SLR camera, the EF17-40mm f/4L USM is especially well suited for digital SLR cameras with an imaging sensor size smaller than the 35mm format. Indeed on such digital SLR cameras these focal lengths can give an angle of view approximately equivalent to that of a 28-70mm lens used on a 35mm camera, which makes it the ideal standard zoom lens.

Superior optical performance
The EF17-40mm f/4L USM has 12 lens elements arranged in 9 groups. Super Spectra Coating on the elements ensures excellent colour balance and minimises ghosting and flare. To provide superb image quality over a 17-40mm zoom range the lens uses three aspheric elements of two different types, while Super UD (Ultra-low Dispersion) glass is used to prevent the chromatic aberrations that often can degrade the subject edge clarity.

Extensive set of high-end features
Minimum focusing distance is just 28mm throughout the entire zoom range.

The Auto-focus works silently and quickly thanks to a fast central processing unit with an improved AF algorithm. You can override AF mode with manual focus should you wish.

Controlled by an electromagnetic diaphragm, the EF17-40mm f/4L USM’s circular aperture can achieve a more attractive appearance to out of focus background areas in a picture.

The front of the lens does not rotate as you focus. This means, for example, that polarising filters still function effectively as you zoom in and out. At the rear of the lens there’s a drop-in gelatin filter holder.

Highly resistant to moisture and dust, the EF17-40mm f/4L USM is ideally suited for use in harsh environments. Environment friendly lead-free glass is used throughout its construction.
Short summary description Canon EF 17-40mm f/4.0L USM:
This short summary of the Canon EF 17-40mm f/4.0L USM data-sheet is auto-generated and uses the product title and the first six key specs.
Canon EF 17-40mm f/4.0L USM, Wide zoom, SLR, 12/9, 17 - 40 mm, Canon EF, USM
Long summary description Canon EF 17-40mm f/4.0L USM:
This is an auto-generated long summary of Canon EF 17-40mm f/4.0L USM based on the first three specs of the first five spec groups.
Canon EF 17-40mm f/4.0L USM. Component for: SLR, Lens structure (elements/groups): 12/9, Lens type: Wide zoom. AF actuator: USM. Colour of product: Black. Diameter: 8.35 cm, Filter size: 7.7 cm, Length: 9.68 cm. Magnification: 0.24x
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Lens system
Component for*
What this product is used as a part of (component for).
Lens structure (elements/groups)*
The way in which a camera lens is constructed.
Lens type*
Category of lens e.g. tele, close-up, macro.
Wide zoom
Focal length range (f-f)
Measure of how strongly the system converges or diverges light. For an optical system in air, it is the distance over which initially collimated rays are brought to a focus. A system with a shorter focal length has greater optical power than one with a long focal length; that is, it bends the rays more strongly, bringing them to a focus in a shorter distance.For an optical system in air, the effective focal length (f and f′) gives the distance from the front and rear principal planes (H and H′) to the corresponding focal points (F and F′).
17 - 40 mm
Lens mount interface*
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 rangefinder camera, single lens reflex type or any movie camera of 16 mm or higher gauge.
Canon EF
Diagonal angle of view (max)
Diagonal angle of view (min)
Number of diaphragm blades
Closest focusing distance*
0.28 m
Maximum aperture number*
The maximum size of the hole through which light enters a camera.
AF actuator
Auto focus
Device focusing a camera or other piece of equipment automatically.
Manual focus
Colour of product
The colour e.g. red, blue, green, black, white.
Weight & dimensions
Diameter *
Distance from one side of a body (circle or sphere) to the other side, measured by a straight line passing through the centre of the body.
8.35 cm
Filter size *
A filter is a screen, plate, or layer of a substance which absorbs light or other radiation or selectively absorbs some of its components e.g. a UV filter to reduce UV light. Filters come in various sizes.
7.7 cm
Length *
The measurement or extent of something from end to end.
9.68 cm
Weight *
Weight of the product without packaging (net weight). If possible, the net weight is given including standard accessories and supplies. Please note that sometimes the manufacturer leaves out the weight of accessories and/or supplies.
500 g
Other features
The degree to which something is or can be magnified (made to appear larger than it is).