Why don't(doesn't?) all mouse manufacturers use this on stock mice? As far as I know only A4tech do this with V-track mice..
V-Track doesn't have any "tape fix" or "light blocking mechanism" to achieve that effect. The light is being trown towards the ground completely vertical thus whenever you lift your mouse, if it's not exactly 90º from the surface, it will stop tracking.
Originally Posted by Skylit
Oh Okay. it's actually an Avago sensor. Yeah, it will work, but pretty difficult to position placement.
We're talking about a milimeter or sub-milimeter precision to get the desired effect. Also, it depends on the lens, if the light is being twisted around you might even want to put the tape "fix" between the light stream and the sensor itself.