Consider the following combinations that might be used
on an EOS-3 camera:
[1] 300mm f4 canon IS + canon 2X converter
for an effective 600mm f8;
[2] 100-400 canon IS set to 400mm + canon 1.4X
convertor for an effective 560mm f8.
Which will be sharper?
Which will focus faster?
Is there any pracitical difference between the two combinations?
The intended use is for bird photography, specifically spring
migrants, especially warblers. Anyone with experience,
please comment.
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