Sniper Scope

Zoom only engages on weapons that feed on bullets or on a few shared ammo types, so the Flamethrower, the Stake Launcher and the Clentaminator all get it while the Dart Rifle and the Piranha Gun do not. The damage and crit bonuses apply to every ranged weapon regardless, so a bow user still gets the numbers, just not the view.

Wearing it widens the region the game uses to decide where enemies may appear, and it does that whether or not you are holding the zoom. Any spawn farm tuned around the normal box will start leaking mobs outside your kill chamber. Take it off before you go idle in a farm, or design the farm with the scope on from the start.

Stacked with the Recon Scope the bonuses double cleanly, which is the usual endgame ranger pairing. Against the Destroyer Emblem the choice is closer than it looks: the scope wins on crit, the emblem also feeds your minions, so a hybrid build often keeps the emblem instead. Out of combat, zoom plus a Spelunker or Hunter Potion lets you sweep a cavern for ore or bound NPCs without walking it.