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Message: <blockquote data-quote="Ambient" data-source="post: 246621" data-attributes="member: 18392">Thanks Geoff.  I am not knowledgable enough to debate!  I have a budget and I don't want to duplicate too much of what my 18-140 gives me with a new lens. The old 70-210 is supposed to a dust problem (push/pull), so I was just thinking of replacing and updating it. Some one at a local camera store made me second guess my choice because of the math! Maybe I should just order online! I really appreciate you help. I was impressed by the parrot photos and really wish the 2.8 was in my budget but it is not and probably won't be for years to come!  I really hope the f4 will work almost as well.<img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile    :)" loading="lazy" data-shortname=":)" /></blockquote>