In the film you have to be careful, however, that it is applied completely bubble-free and smooth, otherwise man can barely make out what was the reflection is distorted.
On a clear day (like today), the device can not be read because the contrast is too bad. One can see not even whether because the unlit fields it is turned to be well reflected. Here one could still make improvements and darken the unlit fields entirely and not just let know. I have to wait how it behaves in cloudy weather or rain.
