I'm going to San Diego this weekend and for the following week for a conference. Never been there before and plan to visit the zoo. While I usually shoot with a 50mm lens, having a longer lens tends to work better at a zoo. Never been to this zoo before, so don't have a clue how the exhibits are presented. Was planning on taking my D800 rather than Leica, with a 50mm and 135mm lens. Could in theory take an 80-400 lens instead of the 135. Traveling from the East Coast so would like to pack light and not bring a beast of a lens if I can avoid it. Also don't look forward to carrying around the 3.4 pound 80-400 lens all day. Anyone been to the San Diego Zoo and have a sense of how long of a lens is needed for the exhibits there? 135mm long enough? I know this is extremely subjective, as it relates to what types of images I am hoping to achieve balanced by how much weight/bulk I am willing to lug around. Also going to be at the zoo during the day so very possible the animals will be sleeping/hidden and the light may be less than optimal. The 50/135 combo will work well for other aspects of the trip as they are both fast lenses and can be used in low light. Most of the shots for the trip will likely come from the 50. Taking the 80-400 isn't an exciting prospect but I am still considering doing it. Thoughts?