Arka takes the kids to different places. Kids love it. They take their cameras out and shoot at 1 roll per 20 min speed (that was the speed that he mentioned). They don't look in the viewfinder too much but cameras are designed in a way that you don't _need_ to look in the viewfinder to take pictures.
Indeed, if you do look in the viewfinder before taking a picture (as Arka did), the monkey most probably will be in the middle, and from your height, and the picture comes out incredibly boring, and the monkey is boring, like hundreds of monkeys in this zoo.