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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.
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: 06 Mar 2007
The date Icecat noticed for the first time that this product was included in the price list of a channel partner
Info modified on: 21 Dec 2015 23:20:25
The date of the most recent change of this product data-sheet in Icecat.
Product views: 9863
This statistic is based on the 61881 using ecommerce sites (eshops, distributors, comparison sites, ecommerce ASPs, purchase systems, etc) downloading this Icecat data-sheet since 06-03-07 Only sponsoring brands are included in the free Open Icecat content distribution as used by 60239 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.

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, Ultra-wide, 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: Ultra-wide. AF actuator: USM, Maximum magnification: 0.24x. Colour of product: Black. Diameter: 8.35 cm, Filter size: 7.7 cm, Length: 9.68 cm
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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.
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
Maximum aperture number*
The maximum size of the hole through which light enters a camera.
Number of diaphragm blades
Closest focusing distance*
0.28 m
Maximum magnification
Magnfication means making things appear larger than they are e.g. 2x magnifaction means that something appears twice as big as it in reality. The maximum magnification is the greatest magnification possible for the device.
AF actuator
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