Thanks for the replies guys Most of the shots are with my Sigma 10-20mm and a few are with Chris' 17-40mm f/4L (mmmmmmm yea ) Thanks Mike . constructive criticism always welcome! I had a look at work and they don't look quite right. Need to find some calibration software i think. There is definatly too much dead space in some, I was very wary of avoiding the distortion caused by my Sigma so avoided filling the frame completely, probably should have cropped a few down to help a bit!. I ordered the Tamron 17-50 in the end too so will be nice to have a play with that.