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Message: <blockquote data-quote="Owen Krout" data-source="post: 3258868" data-attributes="member: 131330">Further work with the 7dmkii and 100-400mm mki w/1.4mkiii attached have me really happy with the combination.  Like others, I continue to find the auto-focus to be a bit slow and sometimes fussy in lower light conditions.  However, bringing it close with manual focus and then using the auto-focus is easy.  In good light it does fine.  No micro focus adjustments have been made.The first photo of a Carolina Wren was done in quite low light (forest understory) and I had to bring the focus close to spot on then let the auto-focus finish.  The next two were Ring-billed Gulls in perfect lighting to test it on BIF.  I snapped about 20 shots at the time, from 500m out to where it was too far to make a visual ID without the binoculars expecting to maybe get a couple of good in focus.  Actually, only a couple were out of focus or blurred.  Another that did well at extreme range and heavy crop is the Great Egret.  Does well as a good enough Macro for me.  The butterfly is only about 1.5cm wingspread.Overall, very pleased.  Probably best to work without the extender when the lighting is poor, as it often is when I am in China, but works superbly under the bright blue prairie skies of Kansas.</blockquote>