[Riccis]

Ron:

If you are a professional getting paid by your clients, I highly recommend you to look into getting the proper permits. I travel all over the world to cover weddings and, even though it is a major pain, always have the proper work documents (specially when traveling to places like Bahamas and Mexico). If you are a friend of the couple just helping them out by making some images of their wedding, then you should be ok (just state that you are coming for personal and not business reasons).

I've never had an issue in Mexico (just came back from shooting a wedding in Cabo 3 weeks ago) and traveled with an M7, two M8s, four lenses and a lot of film. If you are bringing film, please keep in mind that you are only allowed to bring in 20 rolls and you risk loosing anything you bring over that limit.

When you pass thru customs, they will ask you to push a button that will either flash a red or green light. If you get the green, you are good but if you get red they will go through your bags again. This is completely random and, while I've been lucky enough to never gotten the red light, there is another fellow photographer who was only allowed to enter the country with one professional camera (had to leave the other one with immigration and given back to him upon leaving the country, these are the rules specially in the major tourist areas)

I hope this helps.