I must have confused the two. I was looking at lenses to cover 6x17 just the other day on that chart you linked to me a while back. Must have confused numbers.. In any case, your shot of the the 12 apostles shows that the 110xl is more than capable on 6x17 without the need of a CF Thats a pretty high contrast scene, and if there was falloff, you would think it would be fairly obvious.. To be honest, for arieal shots of reefs etc, I like a bit of vignetting. I've seen plenty of great shots of the barrier reef with vignetting that really draw you to the subject. Worth thinking about.