bind e rcon reload
cl_default_zoom 10
changes your zoom level when you start the game, join servers ( 10 is default, bigger = you see less)
zoom+
to zoom in
zoom-
to zoom out
bind x zoom+
to put zoom in on a bind (replace x with a letter of your choice)
bind x zoom 10
to instantly snap to zoom 10 on your key
you can also do these settings in Settings cog -> Controls (zoom in, zoom out, default zoom)