When I moved from MF to 4x5, I really missed the possibility of moving around looking at the ground glass of the camera to find the perfect framing. To make thing worst, not having a fresnel, I couldn't see the entire picture clearly and made my composition making painful. I had seen many LF users taking test shots with a compact camera in the past. I taught, why not take them with the correct field of view. Always carrying my phone around, I decided to write an application that would help me compose my pictures. Then was born my ViewFinder app.