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Message: <blockquote data-quote="garao" data-source="post: 4773" data-attributes="member: 2066">Hi Mark, I'm afraid to dream past 400 as that would certainly cause my demise too. <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile    :)" loading="lazy" data-shortname=":)" />I hear many good things about the 300 f4 with the tc17, but you would be in manual focus, so it depends on the subject matter. I'm so glad the tc20iii worked out as that would have been my next option. I had to pay a $100 premium on the TC20iii. but I've been waiting for availability for 3-4 mos.The 80-400 is also well liked, but the 300 f4 is preferred. The former is due for replacement and it's hot on the rumor mill, so maybe wait and see would be another option.Hope this helps.</blockquote>