Advanced 138mm CF Diopter Spot50 Gen2 Close-Up Drop-In Filter for professional photography Unique design featuring a 50mm polished, plain area for sharp, in-focus center images Gradual transition to out-of-focus periphery for dream-like, captivating visuals Controllable effect strength, adjustable based on diopter strength, plain area diameter, and focal length Available in three variants with diopter strengths of +1/2, +1, or +2 for versatile photography needs Compatible with a variety of matte boxes, designed as 138mm drop-in filter cells for easy use