Not to thread cap but so I don't clog the forum with different threads...But is there a way to turn off the clicking noise when the IR activates?
No, this would be impossible. That clicking noise is not a notification sound that plays. It's the physical noise of the IR Cut filter moving from the lens.
Light in the IR frequency range is in the air even during a sunny afternoon. Human eyes cannot see light in these frequencies, but cameras can. The light in these frequencies is red. In order to prevent everything from looking red in your daytime images, a special filter is put on the lens that blocks these red IR frequencies from being seen. That allows you to see color images in the daytime without having everything look red. However, at night when the
IR light turns on, this filter has to be removed in order to allow the camera to see IR light. If the filter stayed over the lens at night, the IR lights would do no good because the camera could not see the IR light being output from the IR bulbs. This is also why the camera turns to black and white mode when the IR lights come on to prevent everything from looking red at night. The clicking sound you hear is that filter sliding off of the lens.
It may be possible to take the camera apart and physically remove that filter, but then everything would look red all of the time (or either you would have to run in black and white mode all of the time)...Thus, in order for the camera to function properly, that filter has to be slid on and off of the lens based on conditions and you'll hear the clicking noise when this happens.
