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Focal length is a crucial characteristic of a camera lens. It determines how much of a scene gets captured and how big objects appear in the image. Measured in millimeters, a longer focal length will zoom into a scene, capturing less but making subjects larger.

Think of it as how far your camera "sees." A telephoto lens with a long focal length, like 200mm, brings distant objects closer. Conversely, a shorter focal length, such as 18mm, is like seeing through a wide-angle lens, capturing more of the scene.

In our example, the focal length is 180mm. This means the lens has a moderate telephoto effect, ideal for portraits or photos requiring a slight zoom.

The aperture diameter is essentially the size of the opening in a camera lens. This opening controls the amount of light that enters the camera. Measured in millimeters, a larger aperture lets more light through, which is great for low-light conditions.

In addition, aperture diameter affects the depth of field, or how much of your photograph is in focus. A wide aperture (low f-number) results in a shallow depth of field, perfect for isolating subjects. Meanwhile, a narrow aperture (high f-number) deepens the focus.

Our example had an aperture diameter of 16.36mm, calculated into an f-number of f/11. This setting balances light intake and scene focus, suitable for general photography.

Exposure time, often referred to as shutter speed, is crucial to how your photographs turn out. It is the duration the camera's shutter remains open to let in light. Faster shutter speeds freeze action, making them ideal for sports or fast-moving events. Slower speeds allow more light in but can cause blurring if the camera or subject moves.

Measured in fractions of a second, like 1/30 s, altering exposure time compensates for changes in aperture size, ensuring images are correctly exposed. If a lens lets in more light (like when using a bigger aperture), a shorter exposure time is needed.

In our scenario, reducing the exposure time from 1/30 s to 1/480 s balances out the increased light from changing to a lower f-number.

Shutter speed is a critical aspect of photography that works hand in hand with aperture to create stunning images. It represents how quickly the camera's shutter opens and closes. This speed determines how motion is captured—whether it's a crisp snapshot or a flowing blur.

Fast shutter speeds, like 1/1000 s, are excellent for capturing fast actions like a bird in flight. In contrast, slow speeds, like 1/10 s, are used for night scapes or artistic blurs, as they allow more light and motion into the exposure.

Our exercise adjusted the shutter speed from 1/30 s, appropriate for a higher f-number, to 1/480 s. This change ensured that even with more light from a larger aperture, the photo remained well-exposed, maintaining the right balance of light and motion.