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Message: <blockquote data-quote="Cowleystjames" data-source="post: 292449" data-attributes="member: 13195">A lot of my shooting is on the gallops using this lens, I'm taking burst shots of about 3-4 seconds of a racehorse in full gallop. The images ( about thirty to fourty) are then studied by the trainers looking at muscle tone. These then help them to diagnose any uneven gait.So it's critical to me that the images are precise. Even the TC-2.0III on the 200-400 retains pin sharpness at what is effectively f8, it isn't very often that I use this teleconverters though as generally the TC1.7II brings enough zoom. The 300 f2.8 is also used but it can be harder to grab the exact shots I'm looking for with a horse at full chat, I prefer the zoom capability of the 200-400. However, the 300 f2.8 with any TC is easier for my D800e to focus with than the 200-400 with the TC 2.0 III. I guess it struggles just a bit with f8 autofocus unlike the D4s.</blockquote>