Big improvement in this status.
I use black tape to cover all the Nikon logo and some reflective object on the camera.
change the focal length to 28-35mm, and lock the focus point at 2-3 metres
I initially drilled a hole for putting a long bolt through it and use the thread at the bottom of the tripod head as a nut to lock the entire photographic equipment on the wood stably. However, the bolt does not fit for the thread standard in photography. Therefore, I bought a 1/4" to 3/8" adapter and drilled a screw through it into the wood. It turns out a good foundation to support and steady the heavy DSLR camera.
I have adjusted the mirror to get good responds for releasing the shutter by an infrared controller.
normal exposure taken through the DSLR lens. It depicts that the driver in the car is darkness because of the contracting sun light.
EV +2.0 with PL filter EV +2.0 without PL filter
EV +5.0 with PL filter EV +5.0 without PL filter
Obviously, using the polarizer filter can solve out the problem of the reflection on windscreen. On the other hang, the car's interior is dark, taking picture by two steps over expose can bring the detail back in the driver's area. However, the polarizer filter blocks two steps amount of light, plus two steps over expose, the total is four steps more amount of light than normal, which is not really good for taking shots in rush hour during the sunrise and sunset time. Furthermore, we never know the colours of the following cars. If it is in dark colour or black, the camera is gonna measure the situation is under, and get a longer exposure time and larger aperture. Then it might not have good enough depth of field to cover the sharpness of the focus area. Therefore, taking picture in RAW file could solve it out.
EV +2.0 with PL filter
EV +2.0 with PL filter
EV +2.0 with PL filter
EV +0.0 with PL filter
EV +0.0 with PL filter
Those milky dots are on the back windscreen. They are invisible normally, but when I use the polarizer filter, they appear on pictures. Perhaps I should give up using that filter...!