When attaching filters to the camera, in which direction should the lens be aimed?

When attaching filters to a camera lens, the lens should be aimed forward. This orientation allows for the filter to be positioned correctly in front of the lens, ensuring that it can effectively modify the light entering the camera. Facing the lens forward is essential for capturing the intended effects of the filter, be it for enhancing colors, reducing glare, or controlling exposure. Any other position, such as downward, sideways, or upward, would hinder the proper function of the filter, as it would not capture light in the manner it is designed to do, leading to undesirable results in the images. Thus, aiming the lens forward is key to utilizing filters effectively in photography.