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In response and followup to Andy and to prevent confusion with others. Microseconds and Milliseconds (there is no such thing as a millasecond) are different factors of a second, there is no conversion for microseconds to milliseconds other than 1 millisecond is 1,000 microseconds; otherwise known as 10 to the -3 second, as microseconds are 10 to the -6 second.

When talking about response time of a projector, we are talking in milliseconds, 34 milliseconds is 0.034 seconds or about 2 frames @ 60fps (each frame is 16.6ms as 1,000ms (1 second) divided by 60 is 16.6r). To clarify, we are never talking in microseconds which is represented as ┬Ás. this would be a factor of 1,000 faster than milliseconds, and would indeed be far beyond perceivable.

Lastly I should mention, 34ms is absolutely noticeable, though not as bad as some others, such as BenQ's projectors (specifically the w1070 and w1075) which I regularly measure much closer to 50ms (3 frames of input lag). I should also mention this doesn't really apply to console gamers as much. The perceived lag times of console games and their associated controllers is significantly less than that of PC Gamers. Mouse input lag will always be more noticeable due to the higher precision of the input source ie joystick vs mouse and the fact that over the last 4 generations of console gaming systems, the primary display device was LCD or Plasma Televisions which did not cater to low input lag as computer monitors have.

The average desktop monitor now-a-days is under 5ms response time (though there is the issue of decay that has some effect on the perception of lag, though is not truly relevant in this conversation). As the frame itself takes 16.6ms to propagate, any response time under 16.6ms will be relatively unnoticeable.

This said, I am able to play games just fine on the Optoma EH500 which I have measured to be about a 33ms response time, though variable. I do indeed notice the lag however, but am able to get over it, I am not, however, able to play without frustration at 50ms of input lag with a PC game. The true disadvantage comes when you stack other limitations of input response time on top of this; such as Vertical Sync on a computer game (a process of matching the games frame output to the displays refresh rate) which tends to add 5 to 15ms of input lag. Add to this another 20-30ms of lag within a multiple game via your ping time to the game server (20-30ms ping is considered excellent in online gaming) and you now find you actually have a 70ms or above lag, 45 of this visual to your mouse movements (local lag based on the projectors input lag and the lag of vsync) and another 20ms or likely more of less visually noticeable but absolutely ability and timing apparent lag.

Now, for some you can get away with vsync, the lack of vsync can present screen tearing, where the projector shows two halves of a frame giving a visually apparent non-alignment of the two images somewhere on the screen, generally perceived as a jutter. This will be more apparent on screens that have variable input response times, such as the EH500. The EH500 was not meant to be a gaming projector, it handles some amount of video processing in the background, there are times when this can hold up the image about to be displayed, taking perhaps 38ms instead of 33ms to display the image. This happens often on this projector and tends to cause A LOT of screen tearing, which in turn leaves me with a decision to make, deal with the increased input lag of vysnc or deal with the visual artifacting of screen tearing. If you are playing with 3D glasses, this is not an option, screen tearing will destroy the 3D effect and give you a massive headache in the process.

Now I cannot speak to the GT1080 regarding variable input response or screen tearing as I do not own one, but I can say that if the response time is truly 32ms, this is very sad considering their push regarding this projector was about quick response for gaming; if a not quite proscene business projector (EH500) has the same input response, this does not speak volumes for their attempt. Meanwhile the EH500 has sharpness that surpasses BenQ's W1075, color that is bright and fairly accurate after calibration (though not even close to as accurate as BenQ's RGBRGB wheel) and black levels that far surpass most of Optoma's other home entertainment offerings. Granted it is almost twice the money.

When they come out with a projector that truly measures input lag times of 16-18ms as this projector claimed to, then I will be interested.