My wedding lens list is the 15LTD, 21LTD 31LTD, 43LTD, DA*55/1.4, either the DA70LTD or FA77LTD, and the A*85/1.4.
The 31mm does most of the work for me, I'll use the 15 if I'm doing any shooting in the limo, the 21 sees occasional use, generally for table shots at the reception, the 85 is used for available light in the church from farther back (where I'm not disturbing anyone), the 55 and 70 are used in the studio, the 77 sees use if I'm shooting outdoor portraits.
What is really important is to make sure you have at least one, and preferably two or more spare camera bodies, and if you intend to take up weddings professionally, you should have a complete back up kit in the event of disaster with any one component.
My back up lens kit, for example, is the DA12-24 zoom, the 35/2.8LTD, fa35/2, A50/1.2 and M85/2, carried in a separate bag along with my old K10 and K20. My K7 and K5 are both in use during the ceremony, one on a tripod, the other hand held with flash.
Back up flash is also important, my main flash is a Metz 60CT-2, but I also have an AF280T and an AF540FGZ in my spares bag.
Note, you don't need to be this balls out ready for disaster if you are shooting for fun, but as soon as you are shooting for profit, you really need to be ready for any disaster. Weddings move at a pretty quick and steady pace, and there is little room for going back and redoing shots that were missed because of equipment failure.
Last edited by Wheatfield; 01-18-2012 at 02:16 PM.
Reason: Changed 35mm to 31mm in the second sentence