Of course, an experienced professional photographer can shoot anything, but it is more convenient to use modern advanced autofocus system. Which to choose a system? One that you have, the one to which you are accustomed to, and you know it you will not fail. Ideally, if along with the photographer have two cameras with different zoom lenses. Why two? Imagine that one camera had refused in the process (I will not continue). Miscellaneous optics is needed in order not to lose time to replace obetivov as developing events are not always controlled by the photographer and he has to keep up with them. For supporters of a single camera can be recommended to use zoom with the widest range.
For example, it is very good for this kind of shooting, proved to Nikon Nikkor 24-120. The fact that the camera must be equipped with a flash, you can not speak – no flash is better and does not go to the shooting. Of the most widely used filters will be soft (do not forget to just take it off!). Also do not forget to take at least double spare batteries for both camera and flash. As for the film, then, despite the existence of 'special professional wedding' films, advanced materials, not positioned as a 'pro' is more than adequately cope with the problem (not to mention the cost). Same four layer 'super', made on technology 'Real' will give you excellent results. With regard to the number of recordable material – it is negotiated with the client before the shoot.