Macro: additional equipment
If you shoot with a compact digicam, you are rather limited in your choice of additional equipment. You can use special macro lenses and additional light. An external flash is the best choice, while a built-in flash does not always good for macro photography. Also remember that direct light will always spoil an image. For good results the light from the flash should be a defused as possible. You can do it with the help of a diffuser or a reflector.
As far as digital SLRs are concerned, they can be used with different addition devices. Let’s see what will improve your macro images.
1. Using a special-purpose lens called a macro lens (some manufacturers call it a micro), having a long barrel for close focusing. A macro lens might be optimized to provide its best performance at a magnification of 1:1. Some macro lenses, like the Canon MP-E 65 mm f/2.8, can achieve even better magnification— up to 5:1 macro, bringing the structure of small insect eyes, snowflakes, and other minuscule but detailed objects into striking focus.
2. Placing an extension tube between the camera body and the lens. The tube has no glass in it; its sole purpose is to move the lens farther from the film or digital sensor. The farther the lens is from the film or sensor, the closer the focusing distance (and the greater the magnification) and the darker the image. Tubes of various lengths can be stacked together, allowing for increasing levels of magnification while simultaneously decreasing working distance. With tubes attached, the camera will often lose the ability to focus to infinity.
3. Using a bellows attachment between the camera body and the lens to extend the lens to film plane distance. Similar to an extension tube, but adjustable.
4. Placing an auxiliary close-up lens in front of the camera’s taking lens. Inexpensive screw-in or slip-on attachments provide close focusing at very low cost. The quality is variable, with some two-element versions being excellent. This method works with cameras that have built-in lenses. These lenses add diopters to the optical power of the lens, decreasing the minimum focusing distance, and allowing the camera to get closer to the subject.
5. Attaching a telephoto extender between the camera body and the lens. A 1.4× or 2× teleconverter gives a larger image, adding macro capabilities. As with an extension tube, less light will reach the film or sensor, and a longer exposure time will be needed. However, working distance remains the same as without the teleconverter.
6. Reversing the lens using a “reversing ring“. This special adapter attaches to the filter thread on the front of a lens and makes it possible to attach the lens in reverse. Excellent quality results up to 4x lifesize magnification using fairly cheap, “standard” (not specially designed for macro) lenses can be produced. For cameras with all-electronic communications between the lens and the camera body, such as Canon EOS, reversing rings are available which allow all camera functions, including open aperture metering, to be used. When used with extension tubes or bellows a relatively cheap but highly versatile macro system can be assembled.
7. Reversing a lens of lesser focal length in front of a normally mounted lens using a very inexpensive “macro coupler,” which uses two male filter threads to join lenses. This method allows most cameras to maintain the full function of electronic communication with the normally mounted lens for features such as open-aperture metering. Magnification ratio is calculated by dividing the focal length of the normally mounted lens by the focal length of the reversed lens (i.e., when a 50 mm lens is reverse mounted on a 200 mm lens a 4:1 magnification ratio is achieved). The use of automatic focus is not recommended due to the extra weight of the reverse-mounted lens. Attempted use of automatic focus with this technique could result in damage to the camera or lens. Working distance is significantly reduced as compared to the original lens. Technorati Tags: macro photography, macro lens, digital cameras, additional equipment, macro images
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