1. A good mouse definitely helps, but it's more about practice and familiarity than a good mouse. Plus, DPI doesn't mean anything other than just sensitivity.

2. Yes, for the most part.

3. Probably because scout aim is more movement than tracking and timed ambushes like sniper is, but that's just a theory, keep practicing!

Your aim won't magically improve, it takes a lot of practice, good luck.

1. it helps
2. no
3. with scout you can use movement to assist aim, sniper is only mouse movement and you have a smaller target to hit

1. Good mouse and mouse pad are key if you wanna see the best results possible.
2. Yes, but make sure you haven't tampered with the default windows sensitivity as this will throw off your mouse acceleration. Default is 6/11.
3. Practice being in the right place at the right time and having your dot head level but hidden. They peek you adjust a tiny bit, then bam. Take your time.

I'm no expert but from my past in cs I really try to apply that tf2. I've found both classes are more about positioning, crosshair positioning, and timing than it is about raw aiming. At least in my opinion. Being good at aiming is definitely part of being great at either one, but i think outsmarting them is even more important. Hope this helps.

raw input is a prefrence. i used to play without it, but tried it out and haven't stopped using it since. if this is a common outcome of switching to raw input 1 because of what it does, then i take back what i said.

How to disable mouse acceleration?

Google "MarkC accel fix", then type "find accel" into your tf2 console.

1. A good mouse isn't necessary but recommended. Remember high dpi != good, low dpi != bad
2. It disables windows mouse accel. Disable the tf2 accel and enable rawinput -> no need for an accel fix

What is better, accel fix or raw input?

They have literally the same effect on your mouse ingame.

Why?

because it's the sensor that matters. don't have a shitty sensor? you're good to go. if you're aiming properly, it's not because you have a mouse with 20 million dpi. if you're aiming poorly, it's not because you have a mouse with 20 dpi.

It really irks me to see the constant barrage of DPI nonsense that manufacturers put out. I hope this can be useful information to help understand why mice with ultra-high DPI are hokum.

1. DPI is sensitivity and nothing more. DPI in plain english means, "how many pixels the cursor moves on screen when moving the mouse one inch." Mouse manufacturers like to tout high DPI, but it's a marketing ploy that has very little actual value. If your monitor has a resolution of 1920x1080, a 1600 DPI mouse would require you to move the mouse 1.2 inches to span the entire width of the display. A 4000 DPI mouse would require only 0.48 inches of movement to do the same. Any sensitivity lower than the highest possible lowers the DPI that is being used. It's incredibly unlikely that anyone playing an FPS is utilizing 4000+ DPI.

It's a little tougher to calculate effective DPI in a game like TF2--you'll see different values depending upon your resolution because you're projecting a 3D game onto a 2D monitor and pixels closer to the crosshair will have sharper angles than pixels further from the crosshair.

You can calculate effective DPI in a 3D game pretty closely with the following:

r = resolution
s = sensitivity in inches per 360
f = field of view (usually 90)

(pi * r) / (s * tan(f / 2))

Given the 10 inch example, the rounded effective DPI is 603 if your resolution is 1920x1080. If your resolution is 1024x768, the rounded effective DPI is 322.

There can obviously be other factors in mouse feel, such as positive or negative acceleration, jitter, hand comfort, etc. but in the above examples, any mouse with 603 DPI or higher would be just as "accurate" as the next.

2. Raw input does not disable mouse acceleration. It simply bypasses the windows mouse driver. If your mouse sensor has either positive or negative acceleration, that won't change with raw input.

3. Too many different factors at play to really answer this one. Scout and Sniper have very different aiming mechanics--zoom vs. no zoom, headshots vs general aim, movement mechanics, tracking vs flicking, etc.

Okay, I'm an idiot and should definitely sleep. Carry on.

Thanks for answer, if raw input doesn't disable mouse acceleration, how ? People said you can't completely disable mouse acceleration with a Logitech mouse, is that true?

Sorry for my bad English

here's a random story about mice/mousepads:

i was using a shitty generic mouse. i decided to order a deathadder and goliathus. it took almost a week for them to arrive. in that time, i found a wmo 1.1 in my house and used a 20in/360 sensitivity on my smooth wooden desk and was missing like 10 shots per game as scout. my deathadder and goliathus came. the goliathus was a medium size, not a large so i could not use my 20in/360 sensitivity. i stopped using the wmo 1.1 because i paid for the deathadder and goliathus and felt obligated to use them.