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Message: <blockquote data-quote="RJM" data-source="post: 1580049" data-attributes="member: 66340">Seems like a plan. The 500mm F4P (if that is what you mean about flight shots) manual focus will drive you mad with randomly moving creatures that don't stay still. On the other hand I think it is lighter and better balanced than the bowling ball-like 300 F2.8! If you are going to do much walking perhaps the 300mm F4 might be a better compromise. Certainly easier on the wallet. I prefer the flexibility of a zoom for proper framing when close in so went with a Sigma 150-500mm. The optical stabilisation let's me walk-about without being burdened with a tripod too. For well-lit targets under 20m I think the IQ can be just as good as the best prime lens. But I never print larger than 8x10 or view at higher rez than my HD TV. have fun!Rick</blockquote>