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Message: <blockquote data-quote="BackdoorArts" data-source="post: 436475" data-attributes="member: 9240">[ATTACH]148789[/ATTACH]Here's what Mike is asking.  Current Nikons are said to be able to center focus at f8.  I interpret that to mean that when using the center point of your 51 pt focus system you should be able to focus with a 300mm f4 and a 2X converter, which is effectively f8 at minimum aperture.  If, however, you move away from the center point, will the camera still be able to attain focus with the same f8 minimum aperture?  I do not know the answer, but I would speculate that you might have an issue beyond the dark red circle above, particularly in a low contrast situation.</blockquote>