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Message: <blockquote data-quote="mikew_RIP" data-source="post: 478759" data-attributes="member: 14174"><p>Cant remember that far back but ime sure i used my TC20x with my 55mm,remember you lose two stops and a 2x i dont think would be any good with your 300mm,also i think some of the older 300mm needed the TC3?? which cant be used with the 55 as it has a tube that goes into the back of the lens,all this is from a failing memory so continue researching<img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite8" alt=":D" title="Big grin    :D" loading="lazy" data-shortname=":D" /></p></blockquote><p></p>