n most cases, when you're shooting wild animals, you will use your longest lens, and more time is to adjust the appropriate shutter speed in order to capture the moment. But from the beginning of the f / 16, calculate the aperture should open several block to match the shutter speed is appropriate is very time consuming, but there is an easier way. Is equivalent to "sunny f / 16" rule, can use what I call the "rapid f / 5.6" law to implement and "sunny f / 16" the same exposure: add the ISO value of film you use behind a zero as the shutter speed, aperture of f / 5.6. Using ISO100 film, for example, "sunny f / 16" use 1/125 of a second f16, "rapid f / 5.6" f / 5.6 1/1000 of a second use. Are they the same? Through conversion, will find that they have the same exposure. When animals were taken, this method is easy to use, because most can calculate very less, and usually you use aperture were near the f / 5.6.

By the way, don't know if you remember, the estimate of the exposure is in view of the positive light of the object to be taken. For the side light objects, should be larger than basic exposure to open blocked; For the back light objects (backlight) should open two block; For the whole picture composition is shallow color objects, should shrink a block; For deep color should open a freshman. But remember, these estimates exposure value only in the absence of light meter is used, they shall not apply to when using TTL meter.

Here an experiment: sunny day in Florida, in the case of side light shooting egrets extreme close-ups, should how to estimate the correct exposure value? You should be able to estimate the correct results. Because we will use a telephoto lens, so using the "fast f / 5.6" rule. Narrow first exposure to record the details of the white egrets, because side light to open a large block, now back to the "rapid f / 5.6" exposure value, this is our estimate of the exposure value. Now let's try it's sunny in September, to Yellowstone park photographing dark brown bison. We shot the buffalo is wasn't moving, so we use the "sunny f / 16" law. Because it is a dark object, so open a large block; Because is photographing, so to open two block. So a total of three block up the exposure value from (f / 16 up to f / 5.6). Of course you also can open big or the combination of a narrow aperture or shutter, to choose the one you think appropriate exposure parameters.

Although you don't always use these estimates exposure parameters to take photographs, but "sunny f / 16" law is a helpful reference. You can always use this rule to check your meter readings, because the law provides a known benchmark exposure. If you are in the bright sun, your meter readings should be and "sunny f / 16" law is similar, unless it is something out of the question. The camera's battery fast low? Or you forgot to put the filter in the lens screw down (for example, using the polarizer typically take up two retaining exposure)? When taken in bright light conditions, such as shoot birds or taken in Kenya wildlife in Florida, the best exposure parameters of the camera is set to estimate in advance, so that you can deal with some unexpected things, is helpful to capture.

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