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Message: <blockquote data-quote="Chris B." data-source="post: 1529005" data-attributes="member: 59376">I've been away from this site for quite some time but thought I'd weigh in since I use a 300f2.8L IS with a 2x converter all the time...Although I do own and use a 100-400, the performance of the 300+converters is nothing short of phenomenal. Most of the osprey and eagle shots on my website were made with this combination. But, be forewarned, it's not a lightweight combination... I use mine on  either a Wimberley equipped tripod or a monopod.... or on a beanbag from the car. If you need something to lug around in your travels, seriously look at a 400mm f4 DO.Chris</blockquote>