In macro or "close-up" photography the image of the subject projected onto the film or sensor is roughly the same size as the object itself. For example, an image of a 35-mm long bug would stretch across the entire width of the film of a 35-mm camera. In most opinions, a lens is considered a "standard macro" if a ratio of 1:1 is achieved, but magnifications of 1:2, where the image on the sensor is half the size of the object can also be considered macro. Some lenses can even achieve ratios up to 5:1 and are used for imaging insect eyeballs and other microscale detail. Macro lenses such as the Tamron AF 180mm f/3.5 are optimized for the 1:1 magnification ratio. One afternoon I borrowed this lens from my uncle, who uses it for all his macro work, and went out to shoot some insects. I found that the working distance of the lens, approximately 2 feet, kept me far enough away from the insects so I didn't scare them away. I love the sharpness and quality of the images. Here are some pictures, click on them for full resolution and to see some amazing close up details of insects and spiders...
Ten German Birds
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