A lens should be selected that results in a well cropped image eliminating unnecessary areas either side of the target vehicle, this will result in a larger more detailed view of the vehicle.
The following image shows a very wide field of view across a gateway, the RoboPlate cameras cannot recognise a number plate from this image because it is too small.
The following image shows a much narrower field of view from the same camera, roboPlate cannot recognise a number plate from this image because it is still too small.
The following image only shows the gateway aperture because the vari-focal lens fitted to the same camera has been zoomed eliminating the railings from either side. This has resulted in a much tighter field of view. The RoboPlate camera can recognise a number plate from this. image.
See Zoom Controls for more information.