Reviews and Problems with Canon EF 300mm f/4L IS USM
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Canon EF 300mm f/4L IS USM Lens
The Digital Picture
3 April 2007
Excerpt: The Canon EF 300mm f/4L IS USM Lens is another excellent lens in the Canon L Series . While it has enough focal length to feel long, this very-well-built lens remains relatively small and light. Image quality from the 300 f/4L IS lens is excellent.
Canon EF 300mm f/4 USM L IS - Review / Test Report
15 July 2008
Conclusion: 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.