Is there any way to have a projection without size changing? Blender implements an othogonal projection so the further is an object, the smallest it is. In my case, I would like to get a plane (x-z p.e.) where the feel of depth is lost so if 2 objects have the same size, no matter how far they are between each other that they are going to be seen as of the same size, even if one is centered in the image and the other one is far away. Is it possible to do this?
I think you need to switch your camera lens to Orthographic:


You can get the same effect for your 3D view (not a camera) by pressing 5 on Numpad.