[matt34 (Matt)]

Thanks John

Thanks Greg. It's a shame I can't make AAIC I'm very interested to hear what you say about under exposing. Would you be able to put a summary up after the event?

I think next time I attempt something like this I'd like to take 3 rows of shots (the central one and one to the left and to the right) to help with the coma of this lens esp in the corners (the main reason I stopped it down to f2.5). It would also allow more play with the cropping and cover any stitching errors. I've also thought about using a pano head or something like the nodal ninja, I'd assume that they could be used for a vertical shot to help with the stitching of the final image.