Freewell 150mm Handheld Split Diopter Filter

The 150mm Handheld Split Diopter Filter from Freewell is a circular filter designed to be used handheld. When held over your subject, it provides a multiple refractions effect. The filter works best with 35 to 85mm focal lengths and f/2.8, f/2.0, and f/1.4 apertures.