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Message: <blockquote data-quote="snerkler" data-source="post: 671311" data-attributes="member: 44852"><p>Thanks Mike, appreciate it. I have actually seen that but I believe it’s in relation to the 180-400mm and not necessarily the issue with f6.3 lenses. However, fingers crossed it will indirectly help. I’ve been in talk with both Tamron and Sigma. Tamron have been no help whatsoever but Sigma have been back and forth to Sigma Japan and say that their lenses should work with all focus points at all focal lengths but said if I have any more experience with their lenses to give some feedback and they’ll go back to Japan HQ with feedback. Just so happens I’ve hired the Sigma 100-400mm for next weekend so I’ll do some extensive testing <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite2" alt=";)" title="Wink    ;)" loading="lazy" data-shortname=";)" /></p></blockquote><p></p>