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The lowest energy red spectrum wavelength that the human eye can detect is around 700 nm, and the infrared light with lower energy than the red spectrum is from 750 nm to 1 mm. If we use this band for photography, the flowers and trees will look dazzling, just like all the things in the world are shining. Even the skin is perfect and shiny, like a cream. Infrared photography can reveal a world that is invisible to the human eye, and there is no doubt that this is an extremely beautiful world.
Once upon a time, infrared photography and mass life couldn't be matched. It was only used in some specialized laboratories or exploration satellites. Even when artists are just beginning to use infrared photography, they must use a special freezer to store the film. After the photography, they also need to use special chemicals to develop in the darkroom, which makes the price of infrared photography high.
In the digital age, infrared photography has become popular. This is a great boon for the newcomers to infrared photography, because the novices always make such mistakes. What's even better is that we don't need any expensive equipment anymore, and it's good enough to get a low-cost entry digital camera. The reason is simple. Most high-end camera sensors have a built-in IR filter on the front , while low-end cameras often don't have this filter , even with filters removed. When you choose a camera, remember to choose a preview function, so that you can see the imaging effect in advance and correct it on the spot.
　　 1. Find a camera that can detect infrared light
Maybe you have a camera that can sense infrared light now. If you need to do the test, just take the TV remote control and press the button a few times (remember to test in the darkroom environment). Look at your preview screen. If you see white light flashing on the head of the remote control, congratulations, your camera can sense infrared light.
The equipment I used was Sony's Cybershot DSC F-707. This camera was still positioned in the relatively high-end quasi-professional market when it was launched in 2001. Although in the eyes of the great equipment, the 5 megapixel machine may be the steam engine era. The antiques, fooling Jules Wien is still about the same. In my opinion, this view is only the prejudice of those who only rely on pixelism equipment. This F707 camera is a good model of 8 inches x 10 inches even in daily mode. In fact, 95% of the pictures in my first photo exhibition were taken with this camera. This camera is also easy to handle infra-red photography.
The Sony F707 has become an important reason for the off-the-shelf infrared camera. It has a night scene mode, which is actually a built-in infrared sensor system. Of course this mode is only useful at night.
Sony cameras can't perform infrared photography during the day. One obvious reason is that some clothes can't block infrared light. If you can use infrared in the daytime, the voyeurs probably have a Sony camera. Of course, for those who have patience and perseverance, any modification is pediatrics. Just adjust the F707 to night scene mode, and install the IR filter and the gray film. It looks like a night scene in the daytime.
Infrared photographer Chris Mach uses other entry-level cameras such as the Nikon 950 and 990. Although the two cameras were scorned by so-called “serious†photographers when they went public, I like them very much. The camera's body and lens can be flipped independently, plus the preview mode, when you sneak shot, no one knows what you are doing. Another camera that is widely admired by infrared photography enthusiasts is the Olympus 3030. When a used camera sells for less than $10, it is better to use it for modification. Let us look at the world from a new perspective.
　　 2. Prepare the IR filter
The key to retrofitting a camera for infrared photography is to let the camera think it is still in the normal spectrum for photography. To do this, we need to have some filters on the lens , and after installing the filters, the usual camera settings are meaningless, which is an important reason why you need to preview.
Like most lenses, the F707's lens edge is threaded. This makes it easy to install standard filters such as polarizing filters for outdoor photography. If your lens is not threaded, you can only use one hand to hold the filter and the other hand to operate the camera.
　　 The size and format of the IR filter should match the size of the lens. The F707 lens can hold a 58mm diameter filter. The first filter I used was Hoya R-72, which filters out portions of the light that are shorter than 720 nm. Different filters filter the spectrum differently, and the effect of the sky and flowers on the scene is also very different. The best way to choose the camera filter combination that suits you in different scenes is to try it out. The price of the F707 on eBay is between $225 and $250. If you buy it from here, you can save some money to buy a filter. Depending on the size of the filter ring, its price ranges from $70 to $300.
　 3. Find some gray pieces
In addition to the IR filter , we also need some gray chips to reduce the light entering the camera while ensuring the color of the image. This kind of gray piece and the glasses that you wear when you look at the total solar eclipse are a meaning. The first gray piece I used personally is the ND-400.
If there is no gray film, the photos will be too bright. If it is sunny, it is likely to be overexposed. Even with a gray piece, the photo is probably too bright. Fortunately, these gray pieces are also threaded, and it is good to put a second piece of gray on the filter.