Even if you’re shooting RAW, the histogram on your camera’s LCD is still derived from JPEG data (think “close but not perfect info”). If you’re exposing so that the histogram is as far as you can to the right without clipping highlights, the LCD on your camera still might be too conservative. The histogram in Lightroom is built on the RAW data and is far more accurate. It’s also a heck of a lot easier to see. Further, you can use the exposure slider in Lightroom to determine the correct exposure setting for your camera.
Like many shooters, you might be surprised to learn that you already have all (or most) of the gear needed for tethered shooting.
