I was there in November 2016. Some other considerations to bear in mind are - You are driven out to and back from the upper canyon in open 4 x 4 trucks which can be pretty chilly, dusty and windy. This can be a real problem for contact lens wearers. It was quite crowded with LOTS of people using cell phones, which many would stick up in the air making for challenging shooting conditions. You cannot use a tripod on the standard tours. You cannot wear a backpack as some places are very narrow and you will be in crowds. The extra cost photo tours I saw coming in the other direction still have to deal with the non stop crowds, cell phones up in the air, dust from shuffling feet, etc. It is dusty, and, combined with jostling crowds changing lenses can be risky but not necessarily impossible. You will have both very low, and, very high contrast lighting conditions. A 16-35 f2.8 zoom worked very well for me. I suggest using a wide dynamic range camera and try auto bracketing. The lower canyon is easier to get to but still requires a short hike. There are fairly steep stairs to deal with as well. The stairs were not a problem for me but could be for someone in poor physical condition or quite over-weight. I was told by my very friendly and knowledgeable Navajo guide that the summers are crazy crowded. I will definitely look for other slot canyons on my next visit to this part of the world as this place is being "loved" to death! As always, your mileage will vary.