The 300mm f/2.8L is a fabulous lens and it takes the 1.4 X TC very very well. It will also produce excellent images with the 2.0 X TC III but it is a little more demanding in terms of having good light to really get excellent sharpness and detail such as feathers on a bird. It is smaller and lighter of course than a 600mm f/4L II but the images will not be as good and keep in mind the fact that the 600 also does very well with converters.Originally Posted by Kayaker72




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