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Message: <blockquote data-quote="macshark" data-source="post: 1647916" data-attributes="member: 38208">The important parameter in terms of capturing detail is linear resolution.1D MkIV's sensor has a linear resolution of about 170pixels/mm7D's sensor has a linear resolution of about 232pixels/mmIgnoring the limitations due to lens resolution, diffraction effects, etc., 7D's linear resolution is about 1.36x that of the 1D MkIV. This ratio is very similar to the linear resolution improvement that is provided by a 1.4x TC.If the 1D MkIV's sensor has about 1-stop better noise performance compared to the 7D (which is likely), you could achieve the same resolution (and noise performance) as 7D+500mm f/4L IS using a 1DMkIV + 500mm f/4L IS + 1.4x TC (especially since the 1D MkIV would AF at f/8).</blockquote>