To maximize depth of field in low light conditions, which combination is best?

To maximize depth of field in low light conditions, the option involving a fast ISO setting paired with a small aperture is optimal. This approach allows for a broader depth of field while still maintaining sufficient exposure in low light scenarios.

A fast ISO setting increases the camera's sensitivity to light, which is critical in darker environments. This sensitivity enables the camera to capture clearer images even when light is limited, helping to avoid the need for longer exposure times that can lead to motion blur.

At the same time, using a small aperture (higher f-stop number) increases the depth of field. This means that more elements in the scene will be in focus, which is particularly beneficial for landscape photography or any situation where clarity throughout the frame is desired. The combination of these two factors—high sensitivity to light from the fast ISO setting and increased depth of field from the small aperture—creates a well-exposed image with significant detail across various planes of focus.

In contrast, options involving slow ISO settings or wide apertures would either result in underexposed images or reduced depth of field, which do not suit the goal of maximizing depth of field in low light conditions.