Call Of Duty 4 : Modern Warfare
Steady Aim is a useful perk for players who find that they fire from the hip often. One of its biggest advantages is that it allows for more accurate fire without sacrificing mobility, although pistols and submachine guns already have full mobility while aiming down the sights. While it is not as common, some players also use this perk with sniper rifles, which allows more accurate unscoped use at close range when a switch to a secondary weapon is not an option. It is also often used with the M40A3, an ACOG Scope, and Stopping Power. This is for the sake of "no-scoping" or firing from the hip with a sniper rifle. This is effective because the M40A3 with an ACOG and Stopping Power is always a one hit kill unless the target is hit through cover or is using Juggernaut.
Call Of Duty 5 : World At War
This Perk remains completely unchanged from Call of Duty 4 and is fairly popular, especially on the MP40.
Call Of Duty : Modern warfare 2
Steady Aim is completely unchanged from the other games except for the addition of the Pro Perk. The Pro version allows the player to hold their breath longer while using a Sniper Scope or Thermal Scope, replacing Iron Lungs. Steady Aim is especially recommended for the Masterkey and weapons using the Akimbo attachment, which prevents aiming down the sight, making it both useful and easier to get the Pro version.
When playing in third person gametypes, this perk will also make the crosshair smaller while ADS. Steady Aim is one of the only perks for which the standard and Pro abilities seem diametrically opposed; holding one's breath only applies to sniper scopes and thermal scopes and is used for long range accuracy, while firing from the hip is a close quarters tactic and is very inaccurate with sniper rifles, even when using Steady Aim.
Call Of Duty : Black Ops