RE: Photographing RC planes.
Re your use of the zoom lens...
Coming from the "ultra zoom" world over to a DSLR...I suddenly felt like I was a second class citizen. What's this nonsense about changing lenses every ten minutes?
Until I bought my "DSLR zoom lens" ... a Sony 18-250 for my Sony A350 camera, ..... Now, I was back in business. Zoom up..zoom back..and I didn't need to change the lens unless something really, really special came along. Sure, there are better lenses than mine. But the flexibility of having the lens that I need when I want it, mounted on my camera 24/7.... is worth any slight give up in detail .......Rich