Camera zooming on right click?

I'm currently making a RPG game. In the game there are longbows. Because the longbows shoot far, I think it'd be great if while holding the bow you could zoom in by pressing the right mouse button. How do I make a script that allows for "Zooming in"? I've looked at some models in the ROBLOX catalog but none of them work and some just change the camera view. How do I actually make it so you could zoom in?

To "make it zoom in" it is most necessary to adjust the camera view.

You can access the Camera from a LocalScript using workspace.CurrentCamera. To produce an effect such as the one you describe you will probably be interested in the FieldOfView property.

You can get a reference to the Mouse object being used by the Player using game.Players.LocalPLayer:GetMouse().

Once you have a mouse object, you can connect a function (or functions) to the Button2Down and Button2Up events.

mouse = game.Players.LocalPlayer:GetMouse()
while not workspace.CurrentCamera do wait() end --Wait for the camera
camera = workspace.CurrentCamera
mouse.Button2Down:connect(function()
	--Decrease Field of View (zoom)
	camera.FieldOfView = 40 --Ranges from 80 (wide) to 20 (narrow)
end)
mouse.Button2Up:connect(function()
	--Return to default
	camera.FieldOfView = 70
end)

That should get you started!