Read about 5 degree vs 1 degree spot. Also read about reflectivity of different colours. Lastly your in camera spot accuracy depends on the focal length of the

Read about 5 degree vs 1 degree spot. Also read about reflectivity of different colours. Lastly your in camera spot accuracy depends on the focal length of the lens sitting in front of the sensor. You will also benefit from Ansel Adams’s zone system. Read the book if you have time. I think you will like it. This is why for challenging exposures, we use a hand held meter. Good questions.