How many times have we wondered how do the insects and nocturnal animals, the underwater mammals or even the bats manage to find their way in space using the ultrasounds?
The man’s dream was to find out these things and for that reason the microscope, the telescope and the sonar came to be, capturing images of this kind of phenomena’s.
The fascinating world of infrared is one of the most interesting aspects covered by digital photography, more and more popular every day.
Differently from the human eye which sees the wave length from the visible specter, particularly those between 400 and 700 nano-meters, the digital sensors of the camera are very sensitive to the NIR (Near Infra Red) light and to wave lengths between 700 and 1200 nano-meters, so sensitive that the digital camera producers felt the need to filter a part of this light in order to prevent the contamination of the pictures with infra red light.
This would lead to over saturation of color, over exposure, blooming effect, noticeable when you try to shoot in the “auto” mode the moon on a dark sky.
Due to the IR filters in front of the sensor, in order to get an infrared picture, it is necessary to compensate the action using special filters in front of the objective. These will let only the radiation from the infrared spectrum pass so after a longer exposure the sensor will reach only the infrared light.
The best scenery for IR digital photography is the landscape rich in vegetation, the tree leaves and the grass reflecting perfectly the infrared radiation. Inside an infrared picture they will turn out looking white, the landscape appearing to be winter scenery even though the picture is taken in summer.
The sky does not reflect this radiation in the same degree the vegetation does and this way taking infrared digital photos may result in perfect pictures with a black sky and perfectly dimensioned clouds.
The maximum contrast can be obtained like using the polarizing filters at 90 degrees from the sun, where the sky presents the largest intensity of blue.
Another advantage of the IR digital photography is represented by the ability of capturing very distant details even where the sight is very blurred, resulting in that altitude “haze” so well known to the photographers.
The water in atmosphere reflects the visible light and because in IR photography this water lets the radiation pass, the picture results in a festival of grey remembering the clarity of sepia mixed with the magic of black and white vintage photography, quite unique in every possible way.