ScubaPro Optical Lens Flux Twin, ZoomOVERVIEW If you dive with a SCUBAPRO Flux Twin or Zoom mask and need some optical enhancement, you're in luck. A wide selection of optical lenses are available. Find the ideal diopter lens to enhance your underwater view. Lens choices range from 1. 0 to 8. 0 in . 5 diopter increments. Lenses are interchangeable and will fit the left or right side. Optical lenses make sure you get the absolute cleanest and clearest view of the underwater world. To