One of my favorite in camera compentational photography features is Live Composite. It requires 3 presses of the shitter button. First is a black frame, second beginnings the exposure, the third ends the exposure. This begins the noise reduction. Remember that black frame?. During the exposure only new light is added to each frame. To setup the shot I set Aperture, ISO and shutter speed and in Manual mode and adjust settings prior to using Live Composite. https://learnandsupport.getolympus.com/learn-center/photography-tips/browse-tips-by-camera-feature/live-composite-mode?hl=en-US