What is the recommended way to reduce lens flare?

Using a lens hood is a highly recommended method for reducing lens flare because it blocks stray light from entering the lens, particularly from extreme angles that can cause unwanted reflections within the lens elements. Lens hoods extend beyond the front element of the lens and effectively shield it from side light, which is a common culprit for flare.

While closing down the aperture can minimize lens flare to some extent by increasing the depth of field and altering the light that enters the lens, it can also lead to diffraction, which may reduce overall image sharpness. Adjusting the ISO or changing the shutter speed does not directly address lens flare; instead, these settings affect exposure. Therefore, utilizing a lens hood specifically targets and alleviates the issue of lens flare more effectively than the other options.