| 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) |
Reviews
Source
Photodo.com
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.
The-Digital-Picture.com
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.
PhotoZone.de
The EF 300mm f/4 USM L IS is an excellent lens both regarding build and optical quality. The naked lens performed near-flawless both in the lab as well as in the field where the IS helped in many situations. Combined with the EF 1.4x II converter the quality remains on high level but there's a little penalty here equivalent to about a school mark.
