Screen: This diffuser softens & reduces your light by approx. -1/3 f-stop (value measured directly behind the diffuser screen). The light/shadow contrast is optimally balanced, for example, you can now control runaway highlights, even in strongly-angled sun & the highest contrasts. You get an even base-light & can light from the shadows in portraits, for example, & achieve great image results. Or use a SUN-BOUNCER reflector to create light accents, however desired. In any case, you can now have the lighting situation under control.