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Message: <blockquote data-quote="snerkler" data-source="post: 669210" data-attributes="member: 44852">Thanks for this I really appreciate it. I figured that it was light loss at the long end of the 150-600mm but was hoping that that it wouldn't be the same for the 100-400mm. The reason that I didn't think it would automatically be the case is that my 150-600mm stops down to f6.3 around 420-450mm from memory, yet the AF points don't stop working until around 520mm (obviously there will be a subtle light loss zooming from 420mm to 520mm). It does beg the question why this new AF system isn't as tolerable as the older ones. My guess is that it's either this way by design to 'entice' you to buy Nikon glass, or as mentioned before it's the limitations of the wider AF spread.As for usage, you are dead right. Most people I've spoken to only tend to use centre point/the central cluster and so will never notice an issue. Unfortunately for me, I do tend to use the outer edges for composition purposes. I now need to decide whether I can work around these limitations, or have to contemplate the much more expensive and heavier 80-400mm. I'm thinking I could possibly learn to live with the limitations of the 100-400mm <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite2" alt=";)" title="Wink    ;)" loading="lazy" data-shortname=";)" />Anyway, thanks again. As I said, I appreciate you taking the time to try this and post your findings.</blockquote>

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