Thanks fellas
John, I bought it from HK on e-bay where they run from between $700-750AU. A tad more than the Sigma 10-20, but a fair bit less than the Canon 10-22. The fixed F2.8 is a bonus for interior shots... hmmm should be for great widefield astro too
Hi Andrew, no HDR or tonemapping though I did selectively play with the levels on the sky to bring out the detail there.
cheers,
Rob