Expose to the Right: R5 Mark II and the RF 24-70mm f/2.8L IS USM
Expose to the right — ETTR — is the practice of increasing exposure until the histogram is as far right as possible without clipping important highlights. It exploits the mathematical distribution of data in a RAW file: in a 14-bit file, the brightest stop of light receives half of all the available tonal values. Underexposing by one stop discards half the sensor’s information into the shadow region, where noise lives.
The RF 24-70mm f/2.8L IS USM is the lens where this matters most, because it is the lens most photographers use across the widest range of ambient light conditions. Wide in a dim interior, normal for environmental portraits, slightly long for isolating details — the zoom range mirrors a full working day. ETTR applies throughout.
The method on the R5 Mark II: enable the histogram in the EVF or LCD. Set the camera to Manual or Av with auto ISO. In Av, increase exposure compensation until the histogram’s rightmost edge touches the right wall without climbing it. In Manual, slow the shutter or open the aperture until the same result is achieved. The image on the EVF will look overexposed. The RAW file will not be. This is the fundamental disorientation ETTR requires you to accept — the rendered preview is not the data.
The practical limit is the highlight that cannot be recovered: a bright sky, a specular reflection, a bare light source. These should clip. The technique is not about protecting everything; it is about protecting the tonal values in the scene’s critical mid-range while maximizing signal in the shadows. In Adobe Lightroom or Capture One, pull the Exposure slider left by one to two stops after import. The shadow detail that appears will be cleaner than any underexposed RAW equivalent.
The R5 Mark II’s dual-gain sensor at ISO 400 has remarkable shadow latitude. ETTR makes it better. On a camera this capable, leaving the histogram peaked in the middle is a waste of engineering.