Thank you so much Troy and Colin
I really appreciate your thoughts on this. Sorry for not getting back to you earlier Colin. I'm on holidays at the moment and I seem to have less time on my hands than if I was working
Just had a look at those files you sent. Thank you so much for doing that. I can certainly see what you mean about the vignetting, but the star performance at the edges of even the "soft" version of the lens looks very promissing. I think I will give this lens a shot and hopefully bag a good version. For 400 dollars or so, I haven't got much to loose really.
Thanks again guys
Cheers
Greg