Just bought and fitted a Nikko Sterling 4x40 AO half mildot complete with mounts from the site sponser; very happy with it. I have had (and sold) larger objectives but want to keep the weight down. Did not want to drop to 32mm due to slightly smaller exit pupil. Do not need higher mag or zoom (which also reduces exit pupil). The 4 x 40 is ideal for me; the AO is a real bonus.