My son,has been busy in the film industry,and earned some coin-he bought a 100-400 L series lens-apparently it has a name 'Angelina'-I guess she paid for it!,he is a keen plane spotter-he took off to Sydney for a few days,and looks like he had a good trip.
Great lens Chris I picked one up last year and I've been impressed at how well the glass performs, crisp and clear everytime! Pass on the well done regarding purchase and photo to your son!