Hello, I'm new to this forum, and this is my first post, so please let me know if there's one similar to this on here.


I recently purchased a 17-40 F/4 L lens, but am not entirely happy with the image sharpness. I've tried it from the widest to narrowest aperture, on a tripod and it's nothing compared to the 70-200 F/4 L lens I also have. I did try it last night, on a tripod, set at 40mm taking farily close-up portrait shots. This did yield some impressive picturs I might add, but I'm not that satisfied with the other shots I've taken.


Any suggestions people? Am I doing something wrong? Your advice would be greatly appreciated.


Cheers, G.