Welcome! No question is truly stupid delboyo, but you may get some stupid answers, at least from me! The 28mm gives a pretty wide field of view anyway, and a 17-35 sigma? I'm not familiar with that lens...but at 17mm? you're into fish-eye lens territory I think, (please correct me if I'm wrong peoples) If you are just new, I suggest you get to know your equipment and start out learning some basic guidlines and "rules" of good photography (so you can break the aforementioned rules later on, but in a good way) I think a good 50mm lens is invaluable to your kit too. Have fun and always feel free to post your images & questions here. :-)>