A man with a camera.
A man is taking pictures of flowers.
A man could be holding a camera without taking pictures with it. Nothing in sentence 1 implies that there are flowers. Pictures can be taken of things besides flowers.
exists x1 x2.(a_topic(x1) & with(x1,x2) & n_camera(x2) & n_man(x1))
exists e1 x1 x2 x3.(Theme(e1,x2) & Actor(e1,x1) & v_take(e1) & of(x2,x3) & n_flower(x3) & n_picture(x2) & n_man(x1))