Doug Jensen
Veteran
You could get a very good idea of what a final product could look like with proper monitoring. .
Yes, in a studio or other location with a good monitor and ideal viewing conditions you can expose by how the picture looks. As CML founder Geoff Boyle used to say, "if it looks good, it is good." But relying on proper monitoring is impossible for sports, wildlife, news, documentaries, reality TV, etc. That's why we need to use more scientific methods of hitting the right exposure target. Some things should not be left to judgement calls, and that is why we have audio VU meters, tachometers, thermometers, artificial horizons gauges in aircraft, etc. Just ask JFK Jr. about the dangers of making judgement calls.