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It appears that many ET players play other fps games, and as a result they got all the different sensitivities in the world. For a fact I know it applies to CoD players, but my guess is it would apply to any game as long as its engine doesn't have some quake engine features implemented. I'll show you how to rescale it, so everytime you play with the exact same mouse sensitvity. I'll assume m_yaw=0.022 (y), dpi=3500 (d), windows muliplier=1 (w) and in-game sensitivity=2 (s).

The equation:
S = 360 / (ydws)
S - sensitivity in inches (we'll rescale it in a moment) per 360 degree turn

Substituting this with numbers we have:
S = 360 / (0.022*3500*1*2) = 2.337662338 [inch/360*]

Now we rescale it for cm/360 (1 inch = 2.54 cm):
2.337662338*2.54 = 5.937662338 [cm/360*]

This applies to ET. Now if we need to find in-game sensitivity (in a different game, not having engine with quake features) we modify the equation, now knowing how much we want to turn around (make sure that y, d and w are the same):

s = (S*360) / (ydw). Substituting:

s = (5.937662338*360) / (0.022*3500*1*2.54) = 10.929333041. Bottom line is that mouse sensitvity 2 in ET is equal to 10.929333041 in a different game. I hope I cleared the issue for some .

Always remember that ET engine is so wonky it actually enables windows mouse acceleration without asking, same thing happens with many other games. DPI values above 400 are actually bugged slightly in q3 engine. It was fixed for quake live but no idea about ET.

I recommend following values for ET:

DPI 400
Win pointer speed 6/10
Enhance pointer precision off ( you actually need to regedit this off because ET enables it automatically)

Read instructions and install . Some people actually prefer to have it on, but it is much better to have mouse sensor made for it than any software trick. If you want to test it out, just buy Avago9500 sensor mouse like Ikari Optical or MX518. I don't like it myself and i'm having a good time with my Zowie FK. Really awesome mouse for both ET and quakelive.

[Oh my, I clicked 'quote' instead of 'edit', sory for double posting]

It's great to see indepth debates on such topics, related to our gaming experience. Please more of this. Thanks to the both of you