Response Time at 120Hz
When you switch the monitor to 120Hz, the RTC mode menu becomes unavailable. Why? If the response time or RTC errors increase above a certain level, the image in stereo mode will double (the monitor won’t be quick enough to switch between the left-eye and right-eye frames during the time when both lenses of the glasses are opaque). Therefore the monitor is set up for one and the most optimal mode. You’ll see right now what mode it is.
The response time average is 2.9 milliseconds (GtG) which is similar to the 60Hz Advanced mode.
The level of artifacts is much lower: it is now a mere 3.1% as compared with 5% in the Advanced mode.
And it is even better in terms of the time the RTC-related artifacts linger on the screen: this period is reduced from 13.7 to 5.2 milliseconds. By the way, it was the same thing with the Samsung SyncMaster 2233RZ: its RTC error level lowered when the monitor was switched from 60 to 120Hz, too.
Compared with the 2233RZ, the ViewSonic has a somewhat better response time and a lower level of visual artifacts. Both things are hugely important for the stereo mode to work correctly because they determine if the image is going to double or not.
By the way, I recommend setting the refresh rate of 120Hz without any stereo mode, too, and even if your graphics card cannot yield 120 frames per second because the monitor will deliver an excellent speed and a minimum level of artifacts then.
Brightness and Contrast
The monitor has 100% Brightness and 70% Contrast by default. I achieved a 100nit white by selecting 50% Brightness and 55% Contrast.
The monitor’s brightness is average as today’s monitors go, being slightly lower than 300 nits. The same goes for the contrast ratio which is about 700:1. In the dynamic contrast mode my calibrator could not measure the level of black, reporting zeroes.
In stereo mode the monitor’s brightness is set at maximum automatically while all user settings are blocked. This is due to the fact that the monitor’s brightness is controlled by means of backlight modulation at a frequency of 330Hz. If you set it below 100%, the flickering of the backlight lamps would add up to the switching of the stereo glasses, producing highly undesirable effects.