![]() As there is no way to accurately measure motion delay absolutely, it can only be done by comparison with a control subject that has been determined to have the lowest possible motion delay. The goal here is to have as little smoothing as possible. ![]() The main thing I'll be looking for in this test is sensor smoothing, which describes an averaging of motion data across several capture frames in order to reduce jitter at higher CPI values, increasing motion delay along with it. Any further sources of input delay will not be recorded in this test. Motion Delay"Motion delay" encompasses all kinds of sensor lag. As you can see, deviation is quite small and consistent, which is important as the Zephyr Gaming Mouse lacks software for fine-tuning the CPI. However, please keep in mind that said variance will still vary from unit to unit, so your mileage may vary as well.Īs mentioned above, my prototype lacks the 400 CPI step, so testing 800, 1600, and 3200 CPI will have to do. In this test, I'm determining whether this is the case or not. ![]() It is impossible to always achieve a perfect match, but ideally, nominal and actual CPI should differ as little as possible. There are several factors (firmware, mounting height of the sensor not meeting specifications, mouse feet thickness, mousing surface, among others) which may contribute to actual CPI not matching nominal CPI. Retail units will also include a 400 CPI step.ĬPI Accuracy"CPI" (short for counts per inch) describes the number of counts registered by the mouse if it is moved exactly an inch. ![]() ![]() Out of the box, five pre-defined CPI steps are available: 800, 1600, 3200, 6400, and 16,000 CPI. According to specifications, the 3389 is capable of up to 16,000 CPI, as well as a maximum tracking speed of 400 IPS, which equals 10.16 m/s. Sensor and PerformanceThe Zephyr Gaming Mouse is equipped with the PixArt PMW3389. ![]()
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