So we change it first if something else is better. Then you decide if those are the best numbers you can do for this situation. You start by entering one of the numbers, usually aperture, and the camera meter determines the other one. Your camera meter will first pick one combination with a correct exposure, but maybe another different combination is the best choice for this particular photo situation. In most cases, this is not difficult, and soon we will be able to “just know” at a glance what is necessary.
F stop values iso#
Before you click the shutter, you should have decided what f/stop, shutter speed and ISO combination is to be used, as the best choice for this subject situation. When you’re aware you’re supposed to actually LOOK at the scene, you will have a pretty good idea about the situation when you first walk up. So these can still be automation controlling the actual exposure, but we can choose the settings to use. We start by simply entering one reasonable number choice for the situation, and the camera meter selects the other number matching the exposure. I am speaking of using camera A mode (Aperture Preferred), which likely is most commonly used, or maybe S mode (Shutter Preferred). Experiment a bit, it is the first step of understanding. This is the fun in photography for many of us, to create the photo ourselves, to be the way we want it.
Our brain is the best tool in photography, it sees and knows things at a glance, and it can help the camera, if we choose to use it. Equivalent means that all of them are a “correct” exposure (for the example light level), but we’re looking for the one best combination for our specific situation. All entries on this entire row are Equivalent Exposures. Or f/22 at 1/60 (much depth of field, but bad for motion). For example one exposure combination for this EV 15 is f/4 at 1/2000 second (freezes motion). Shown here is an example row from the EV Chart showing sample values chosen to be a normal bright direct sunlight level (called EV 15).
If we consciously think about what we’re doing when we actually LOOK at the scene, our brain likely “just knows” immediately what it needs. It means choosing the best available exposure combination for the scene situation. Exposure does NOT mean just exposure (not too dark, not too bright). The big advantage of using our human brain is that it can immediately recognize the subject and the situation, and can choose the best choice for this particular picture (and automation cannot). It’s fun getting it right, and becomes our automatic procedure, and is the basics for every picture we take.Ĭhoosing WHAT to point the camera at is a different discussion, but a photo scene allows a wide choice of possible Equivalent Exposure combinations, all “correct” with regard to exposure (even our cell phone must select one). There are many creative choices possible in photography, which does require an adjustable camera, and a little thought about we’re doing, but it’s easy, and is the first thing photographers learn. Except automation has no brain, and needs human help to recognize the situation to choose better choices for the specific scene. Automation is very handy, since we don't have to know anything or to think about it (and we likely won’t even know what the settings used were), but that only result is whatever the automation does. Situations vary, and need different techniques. Exposure is all about using the settings to get the best picture, like by freezing the subject motion or by stopping down aperture to increase the depth of field. “Exposure” is NOT just about how dark or light the picture is. Some basic lens properties are below that.īut first, learning exposure is the beginning skill you need to acquire about photography, and if you don't understand about choosing camera settings yet, you’ll surely want to look into it. The actual Numbers part starts just below. There is of course much more to photography, and understanding the “What, Where, When, and Why” about using these settings is necessary to ever get out of Auto mode (to have any control of your pictures). This article is about "Understanding the camera Numbers".
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