Battlefield 3 introduced scope glint, a gameplay mechanic added to high power scope attachments. A high power scope is defined as a scope with a zoom greater than 4x. This causes a sniper's scope to be visible from a considerable distance as a bright glare. The glare is brightest when seen from the direct line of fire and is less noticeable at off angles. This effect can be mitigated by either aiming away from the enemy (and using peripheral vision), switching to another weapon, or by switching to a low magnification optic or Iron Sights in customization.
In Battlefield 4, scope glint will only be visible to someone within a 10 degree viewing angle of the sniper, and only when the user is actively aiming down sight.
The Sniper Decoy produces visible scope glint to attract attention. The Trench Periscope produces a pair of closely spaced glints, but the user can peek over cover.
Scope glint can be seen through terrain, likely as an unresolved bug.
Normal scope glint produced by a sniper rifle.
Rainbow scope glint produced by a sniper rifle while standing within its Sweet Spot.
In Battlefield V, the scope glint appears on Recon's Bolt-Action and Self-Loading rifles equipped with medium- or long-range scope. The Sniper Decoy (returning from the previous installment) produces a visible scope glint.
