In prac­tice, how­ev­er, envi­ron­men­tal noise and light loss­es between the two instru­ments degrade the qual­i­ty of the light sig­nals, lim­it­ing the pos­si­ble dis­tance between them.
In the­o­ry, the fur­ther apart the tele­scopes are, the high­er the image res­o­lu­tion. In prac­tice, how­ev­er, envi­ron­men­tal noise and light loss­es between the two instru­ments degrade the qual­i­ty of the light sig­nals, lim­it­ing the pos­si­ble dis­tance between them.