What 2 lenses of the following would you bring with you to take photos in the park with a friend? I've got a 21mm, 35mm, and 50mm. I am leaning more to taking the 21 and 35 because then more of the park is in the shots than with the 50mm and I feel that would make it easier for street/portraits. With the 21mm being good if I need a really wide angle.