I will be attending the Grand Sumo event in January 2010 in Tokyo. Here is a view of the building: http://upload.wikimedia.org …an_Tsuriyane_05212006.jpg
I do not know where I will be sitting. I was thinking about taking a 135L with 1.4x for flexibility but I think I will probably just opt for using a 70-200F/2.8L IS and a 16-35L for wide-angle shots like the wikimedia shot above. Flash is allowed but I'm not sure how effective it will be. I believe this is very similar to shooting basketball in the US. Any pointers from experienced indoor sports shooters would be appreciated.
I will probably either be sitting ringside or 5-10 rows back of ringside or the first row on the top level depending on seating availability. Ticket availability varies by day and I plan to attend on an early day on a non-weekend so there should be good seats available. Ringside would be optimal but I'm told those are extremely difficult to get. The throws are quite fast and I want to try to get some action shots. It will have to be handheld because of space constraints. The actual building lighting is not very good.