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Message: <blockquote data-quote="Helios" data-source="post: 1335328" data-attributes="member: 46553">It's an old AIS manual lens that time forgot. Rather like the 400/3.5 and 600/5.6 which Nikon used to make. I use a manual 500/4AI-P which I would rate as superb for image quality. Manual focus is no problem for most bird photography (apart from BIF).Persopnally I don't see the point in moving from a D300 and 300/4afs to a 40d and 400/5.6. The 400/5.6 will have faster autofocus but the 300/4 will focus closer and is better for dragonflies and tame birds.Lots of people on BF have moved from Nikon to Canon though. Don't know any that have moved the other way (despite the big splash that the D3 made, and the 200-400/4VR lens). I suppose people feel that Canon is inherently superior for nature photography, although I can't see any real evidence to support this.</blockquote>