The 4 × 5.6 Lindsey Optics +3 Diopter Close-Up Lens fits into most 4″ × 5.65″ matte boxes and helps you focus on smaller objects your cine lens just can’t capture on its own. The 5.1" lens diameter means this lens can be used even with wide angle lenses, and a broadband multi-layer anti-reflection a coating (MC Coating) reduces reflections from the lens and prevents unwanted ghosting and flare. This +3 diopter version requires 3 matte box slots.