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Message: <blockquote data-quote="-Vincent-" data-source="post: 1815863" data-attributes="member: 85929">Hey everyone! First post here and looking forward to getting involved! I'm in a similar situation as Joseph and was also wondering about the Canon EF 100-400mm f/4.5-5.6 L IS USM; @Mike: you said you'd recommend that over the 400mm L for more keepers.... could you or anyone with experience on these lenses elaborate on the differences between zoom- and prime- lens in this comparison? From what I've read so far the 400m is sharper than the 100-400?Thanks a lot in advance, and good luck searching Joseph <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile    :)" loading="lazy" data-shortname=":)" />Best birding-wishes,Vincent</blockquote>