Icecat the open catalog

Add to compare
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 300 mm f4.0 L USM IS
Article code :
The brand's unique identifier for a product. Multiple product codes can be mapped to one mother product code 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 data-sheets 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: 27 Jun 2005
The date Icecat noticed for the first time that this product was included in the price list of a channel partner
Info modified on: 25 Jul 2013 06:48:13
The date of the most recent change of the data-sheet in Icecat's system
Product views: 24608
This statistic is based on the 62293 using ecommerce sites (eshops, distributors, comparison sites, ecommerce ASPs, purchase systems, etc) daily downloading this Icecat data-sheet since 27-06-05 Only sponsoring brands are included in the free Open Icecat content distribution as used by 60342 free Open Icecat users.
Long product name Canon EF 300 mm f4.0 L USM IS:
The short editorial description of Canon EF 300 mm f4.0 L USM IS
EF 300 mm f4.0 L USM IS

Marketing text Canon EF 300 mm f4.0 L USM IS

The official marketing text of Canon EF 300 mm f4.0 L USM IS as supplied by the manufacturer
This lens is an EF 300mm f/4.0L USM.


Diagonal Angle of View: 8° 15' Lens Construction (elements/groups): 8/7 No. of Diaphragm blades: 8 Minimum Aperture: 32 Closest Focusing Distance (m): 2.5 Maximum Magnification (x): 0.13 AF Actuator: USM Filter Diameter (mm): 77

Compact L-series telephoto lens with an Image Stabilizer that compensates for camera shake with the equivalent effect of a shutter speed two stops faster

A more portable 300mm telephoto lens. Two UD-glass elements effectively correct secondary spectrum. Superb resolution and contrast. Astigmatism is also corrected, and background blur is soft and nice. Built-in hood with a locking mechanism.

Short summary description Canon EF 300 mm f4.0 L USM IS:
This short summary of the Canon EF 300 mm f4.0 L USM IS data-sheet is auto-generated and uses the product title and the first six key specs.
Canon EF 300 mm f4.0 L USM IS, 8/7
Long summary description Canon EF 300 mm f4.0 L USM IS:
This is an auto-generated long summary of Canon EF 300 mm f4.0 L USM IS based on the first three specs of the first five spec groups.
Canon EF 300 mm f4.0 L USM IS. Lens structure: 8/7, Thread diameter: 3.54" (9 cm), Diagonal angle of view (max): 8.6°. Filter size: 3.03" (7.7 cm), Weight: 2.58 lbs (1.17 kg). Magnification: 0.13x
This is a demo of a seamless insert of an Icecat LIVE product data-sheet in your website. Imagine that this responsive data-sheet is included in the product page of your webshop. How to integrate Icecat LIVE JavaScript.
Lens System
Lens structure*
The way in which a camera lens is constructed.
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′).
Thread diameter
3.54" (9 cm)
Diagonal angle of view (max)
Weight & Dimensions
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.
3.03" (7,7 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.
2.57 lbs (1,165 kg)
Other features
The degree to which something is or can be magnified (made to appear larger than it is).