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Originally Posted by Christine
a reasonable image can be obtained using a 2x with the 100-400 but good light is needed and a tripod is recommended.But I find it is difficult to judge if one has the mf spot when viewing through the viewfinder esp on the 20d
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With the 2x on a 100-400 it's going to be vital that the dioptre adjustment on the viewfinder is set perfectly for your eye. Otherwise it'll look as if it's in focus when it ain't.