PRTmini - Take Complete Control over White Balance, Exposure & Sharpness - Smartphone, Point and Shoot and DSLR Cameras High-quality PVC plastic water resistant with specially formulated anti-reflective coating Are you shooting snapshots with your Smartphone? Are you a Professional Portrait or Wedding Photographer? Do you visit beautiful coral reef under the sea? PRTmini helps provide perfect Color Calibration, Exposure and Image Sharpness