Camera has strange behavior when rotating in more than 1 direction

[ThanksRoBama (Emma)]

I think this is the same issue as what I described here:

How do I stop camera from rotating on Z axis?

It kinda makes sense that you get some roll. Try holding out your hand flat, pitch it up by e.g. 45 deg, then yaw it on its local Y axis by 90 degrees. Your hand should end up with 0 pitch but 45 deg of roll! To prevent this, you shouldn’t yaw on the camera’s local Y axis, but around the world Y axis. Since cf * CFrame.angles(pitch, yaw, roll) rotates on the axes relative to cf (in a specific order of pitch/yaw/roll, don’t remember which), we need to transform the yaw rotation from world space …