Basics of Photography – Exposure.

Exposure control is one of the most important aspects of photography when working with a DSLR or any camera that gives you full manual control. It allows you to set up the shot, choose the most appropriate lens, adjust the camera settings and make deliberate decisions before pressing the shutter. This is a simple introduction to photographic exposure, intended to provide a basic understanding of how exposure works and why it is fundamental to developing photographic skills. It is an approach that I have found particularly useful when introducing young students to photography.

When I begin working with students, the first priority is to make them feel comfortable handling a DSLR (this is the camera format we normally start off with) and understanding its basic controls. Once they have developed confidence using the camera, we move on to composition and the design elements, helping them understand how the arrangement of subjects, the use of line, shape, pattern, balance, colour and space allow them to take greater control over each photograph they make. Rather than simply recording a scene, they begin making deliberate visual decisions about how an image is constructed. Once these foundations are in place, we move on to taking full control of exposure.

The first part of the exposure triangle we explore is ISO, helping students understand how to adjust the camera's sensitivity to light, or in the case of film photography, the sensitivity of the film itself. We then move on to aperture, where students learn how the size of the lens opening controls the amount of light entering the camera. At the same time, they begin to understand how aperture affects depth of field, allowing them to decide which parts of an image remain sharp and which fall out of focus.

The final element is shutter speed. Here, students learn how the length of an exposure influences the way movement is recorded. They discover how faster shutter speeds can freeze motion, while slower shutter speeds can introduce blur and convey movement within the frame.

Once students have developed a basic understanding of ISO, aperture and shutter speed individually, they begin to combine all three settings to achieve the exposure and visual effect they want. Learning how these controls work together is a significant step towards taking creative control of the camera rather than relying on automatic settings. In my view, understanding the exposure triangle alongside the principles of composition and design provides one of the strongest foundations for photographers of any age.

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