I'm headed to Mexico City in 3 weeks and am preparing what to bring or purchase for taking photos down there. We're gonna be seeing cathedrals, murals, ancient pyramids, beaches, ruins, etc. I was thinking of stuff to rent or buy before I leave. Here's some info on the trip: Mexico Ancient Civilizations & Mayan Ruins - All-Inclusive Vacations But I was thinking of getting a nice wide angle lens for a lot of these shots. Is there a filter I would need? I was in the market for an off camera flash but I don't think I'm gonna need it for the trip ... ? So I think I'm gonna have to wait til be come back from the trip to buy my SB600.