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Message: <blockquote data-quote="cwpbirder" data-source="post: 1168595" data-attributes="member: 56126">I use the Canon 400 f5.6L USM, and get satisfactory results without IS - I can hand hold it on 1/800 sec or above depending on light levels, you really need sun - or rest it on the scope and tripod down to 1/500 sec, using asa 200 or 400. I bought a new one on ebay and saved £200.... The IS lenses are a huge amount more expensive - £000s</blockquote>