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Canon EF 300mm f/4 L IS USM

Canon EF 300mm f/4 L IS USM Specifications
Frame Coverage 35mm
Lens Construction (groups) 11
Lens Construction (elements) 15
No. of Diaphragm Blades 8
Minimum Aperture 32
Closest Focusing Distance 1.5m (59.1")
Maximum Magnifcation .24x
Filter Diameter 77mm
Maximum Diameter x Length 90mm x 221mm (3.5" x 8.7")
Weight 1190g (42oz)
The IS implementation on the EF 300mm f/4 USM L IS can give you an extra potential of 2 f-stops - possibly a little more due to the weight of the lens. This is less than in modern Canon IS lenses but it's very useful nonetheless. The build quality of the lens is great but that's also something that we simply expect from a lens in this price class and especially from a Canon L-class lens.
The build quality alone qualifies the price of this lens, which appears as though it will outlast any owner! The built in hood is a neat touch that just about escapes getting in the way of filters. The only let down is the slightly sluggish (for the class of lens) autofocus.
William Castleman
The EF 300mm f/4 L IS USM lens is a very sharp, light, compact, high-performance telephoto lens. It is a valuable substitute for the EF 300mm f/2.8 L when weight, space (or cost) restrictions do not allow use of the larger and heavier, slightly more capable lens.
I found myself using this lens primarily for nature and wildlife photography. When paired with the Canon Extender EF 1.4x on a 1.6x FOVCF body, this lens can even venture into short range bird photography.
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