I had someone the other day come up to me and ask, how do I know my images are correctly exposed? Well, this is not difficult. One just has to put in the time and understand light, your light meter, your camera settings (Aperture and Shutter, ISO)….
Now for me….I always shoot 400 speed film as I work mainly in street photography. So given that, my ISO is always 400, right? That is one leg out of the way and now I just have aperture and shutter as variables.
First….trust yourself…. learn to shed those inhibitions or worries of taking the ‘perfect photo’ for yes, we all have our photos which come out a bit under-over exposed. So what? …. It isn’t the end of the world. So get away from the fear factor of imperfect photo’s.
Second…. learn the Sunny 16 rule. As mentioned, I shoot with 400 film so I know part of the tri-leg is ISO. Using the Sunny 16 rule I then try to keep my shutter at 500 since I am using 400 film, so I set my shutter at or near that ISO speed. From that, I look at the weather, the sun, the light…. If a hot day and the sun has sharp shadows, then I go for F16. If a sunny day on somewhat blurred shadows, I go with F11. If a partial cloudy day with shadows someone and going, I shoot F8. If cloudy, I shoot 5.6.
Now…it also depends on what you are attempting to expose. Are you in the open or in the shadows? you have to adjust for that.
Third….practice the Sunny 16 rule. Get a portable light meter and just walk around with it all day. Anytime you see a potential shot, take a reading. But before you take that reading, attempt to guess at what you feel might be the proper settings? Do you want F8 at 500 or perhaps F11 at 200? They are the same. Do you want F5.6 at 500 or F8 at 200? …. The wider or closer you are might vary depending on what you want in focus? More….or less?
Practice….Practice….practice….. just take the meter with you the way to the grocery store, or running an errand and sitting in a car. Eventually it will become second nature to you. Whenever I go outside,….my brain naturally thinks of ‘metering’ the scene. Am I metering under a tree, or in the open?
So it is not a mystery….photographers have been reading the light for over a century and a half…. it isn’t rocket science. But you do need to practice. Today with digital photography and “P” mode’ and automate or AP priority etc…. people really are not ‘thinking’ when they do photography, they merely take a snapshot; knowing the camera will do the rest. Digital has forced laziness upon folks. The light meter inside their camera tells them which way to turn the F-stop. To the left, to the right….stand up, sit down, fight fight fight. But hey, you get it…… I am essentially connecting the dots and waiting for the red dot to light up in the middle to know I have exposure correct, or…..I don’t even do that and just have everyone on “P” mode, the ultimate lazy man’s way. To boot…look at ISO as modern cameras go up to 50,000 or more in ISO compared to my 400 (film speed). Gees….
So…challenge yourself. Find a manual camera film, or even a digital camera that allows you to shoot manually….. Learn photography.