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Message: <blockquote data-quote="amilne" data-source="post: 1168623" data-attributes="member: 1156">The difficulty that I see with the 400mm f5.6's is that I will want to get a longer prime lens, probably sooner than later, and there have been many reports that the 40D is worse than the older reduced frame cameras at autofocussing (if that is a word) with convertors with taped pins. I'm happy to try taped pins or the 1.5 Kenko, including with the 400mm DO, but I don't want to depend on it. I do know they cost £1000's but needs must when the devil of Got-to-have-one drives, as they say....At least the glass keeps it value well if I don't ruin it, which I probably will, looking at everything else I've ever bought. I have got a few ideas up my Heath Robinson DIY sleeve to try to protect my good lenses better than a simple lens cover though, although I'll have to be careful not to ruin my new lens, whatever it is, before my design materialises. Thanks both</blockquote>