The previous issue we talked about the histogram, how to nail the histogram, how to determine underexposed and overexposed and could be the high light and shadow to approve overflow. In short, the period comes after the shutter is pressed, how do we judge the exposure. In this issue, we talk about the shutter is pressed ahead or behind a problem discovered how to control exposure exposure.
[how to]
exposure compensation using a digital camera features automatic or semi-automatic exposure, many human are accustomed directly by machine measured light exposure table. Machine measured the light table does not know thatwe must shoot someone bright or dark things, it will measure it as a reflection of things among the 18% gray, then give us a outcome. Measured in consensus with machine table gives exposure combination of light shooting, things will be shot gray ashes,
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will reduce exposure and more exposure, less will darken the photo. If the table by shooting light machine measured the dark things, such as our final publish in the context of dark shot black records, and then you get a gray backdrop gray of this - and more exposure. Reduce the exposure to darken photos, black gray background, and record this also black. Less exposure will increase exposure, plus exposure photograph is clarified. If the light measured in accordance with machine taken off the table things, such as the white background of shooting a pearly laptop, then get a gray background gray laptop - less exposure. Increased exposure brighten your photos, gray background white,
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This is the exposure compensation,
GHD Hair, the famous It has two meanings: one is the highlighted part of the metering range is larger than the shadow part of the area, exposure metering based on the need to suitably increase the exposure, otherwise you will need to appropriately reduce the exposure; the other is if we want to some photos brighter, you need to increase exposure, and vice versa need to reduce exposure.
know the and or the minus, the problem to be solved is how much at how much. Previously looked a table, a list of the many scenes in the experience of exposure wage, such as sleet and 3 block, block coal stack minus 2, plus 2 block ... ... the waterfront. Forget these diagrams it, even in the movie epoch, these experiences are no one hundred test Braun: such for snow beneath the sun there is the shadow of the snow and the snow of the points, could not be blocked along the board are plus 3.
the one we know how to use the camera's histogram to determine exposure, exposure compensation to send it more intuitive and accurate basis. Exposure of more, much more to lose much,
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each camera exposure compensation operation is different, you can peruse the camera direction manual well to familiarize ourselves with the variety of camera automatic exposure compensation operation.
[our digital cameras test exposure is prejudiced? ]
Complexity of modern digital cameras, no one can certify the measured exposure of each camera system is not offset. To this end, a number of models have appeared in fine-tuning exposure settings, like the skin on the just equilibrium function, the pointer to return the correct Without this feature digital cameras, we need to memorize that the test results, manually adapt the shooting.
. This is a little more right! However, if we know the camera exposure measurement error is the amount of at least two advantages: 1, respective to the proper exposure amassed experience; 2, the error is too large to be sent to repair station livelihood know. So how quickly and easily reckon and test the camera exposure error alteration do? We recommend that you buy the camera to do about this test:
1, the camera sensitivity is set by a fixed amount above and select a metering mode, exposure compensation is set to zero.
2, come up with reflectivity of 18% gray panels on the uniform lighting conditions.
3, so full of gray ash board camera viewfinder.
4, the camera's focus mode dial to manual mode, aimed at infinity focus.
5, press the shutter, and then view the histogram. If the histogram shows the distribution of pixels is not central, then measuring the digital camera exposure system error.
6, if a digital camera there is a slight mistake of measuring exposure system, exposure compensation can be set up to re-shoot the pixel histogram shows the distribution of returns to the center, the compensation amount is the amount of camera mistake.
7, change the metering mode, repeat step 5.
8, repeat step 5 to change the sensitivity.
] [how to select the combination of exposure
a cup under the tap water connection. Half of the tap open, 40 seconds then full cup of water; tap entirely open, only 20 seconds the cup was fraught. Faucet open gate the size and time of prologue the gate is to control the amount of water into a pair of combinations. Filled the same glass of water, tap to open the bigger, the less time required, the more small taps open, the longer the time essential.
light favor pat water, the lens aperture diameter of the gate like the pat size, shutter speed favor this width of time the door opens. Aperture diameter to open the bigger,
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control the lens aperture size is the We can use many combinations of aperture and shutter to acquire the same exposure. So, in so many combinations to choose?
we talked almost in previous phase and the depth of field control technology to occupy moving objects, these 2 techniques involves the use of aperture and shutter. If we want to get the lusted depth of field, aperture size can be considered to select the alignment of exposure, this is the so-called objects play a premonitory role, you can first consider the composition of shutter speed to select the exposure, which is cried Program AE (P) is given automatically by the camera is a fusion of exposure. Both aperture precedence, shutter priority or program exposure, permit us to change the exposure by control of the camera combination. Therefore, these auto, semi-automatic exposure mode and manual exposure (M) is no different, just to make us faster and easier access to operate it.
For beginners, we recommend using manual exposure (M). Practice using manual exposure, not because that would look cool, merely to let beginners versed with the aperture and shutter combination of this exposure, more importantly, through the exercising manual exposure can amplify in the digital view finder and the ruler habits. A pair of mathematics is the combination of exposure, while the ruler is the machine measured the light reflected in the table.
[bracket]
film era, bracketing a dual purpose. First, the fast shooting to attend to the precision of the exposure, the use of bracketing exposure can help us get a relatively accurate picture, of course, this also manner that likely loss of key moments; second, not sure when the exposure is accurate, the use of Bracketing which can ensure a relatively accurate exposure.
digital camera era, we have maintained the first character, that is all quick shooting period to outlook the histogram, using the bracketing exposure can help us acquisition a relatively exact picture. For film times bracketing the second effect, because the histogram, so if there is period to check it, we do not need to go to bracketing.
However, digital cameras, there is a very major technique apt use to exposure bracketing. That namely what we in the If the scene is very sunny and very black portions beyond the range of the camera can record, then only one exposure of the photo must flood. If we ambition a very bright and very dark chapters are the detail preservation, we need a
camera may occasion a puny transmission of the dramatic addition in the sum of post-operation, even with high-performance personal calculator, it may emerge strange because the picture and come to naught unless we try to play. Therefore, the use of touch the camera to reduce the digit of times. In that row 9 bracketed HDR to complete a camera shot, in most cases, we basically do not need to touch the camera.
camera to record the scene when the brightest and darkest areas, we can also use Many of the details, so that photos see beautiful.
shot using the HDR technique, determine the same aperture, curtain speed that is only through the regulation of way to different exposure. This is done to change the aperture depth of field ambition not change.
[How simple determination of the dynamic range of digital cameras]
we need to know the camera's dynamic range. In many cases, this can aid us quickly decide whether a great light than the scene outdoor the camera range of records, and which part to reserve the details of the culling or the choice of whether to accept the HDR technique. Rough determination of their dynamic range camera tool is very uncomplicated, equitable a gray board. As follows:
1, the camera sensitivity set at a fixed value on and select a metering mode.
2, the reflection rate of 18% of the gray panels on the uniform lighting conditions.
3, so full of gray ash board camera viewfinder. The camera's converge mode dial to manual mode, aimed at infinity focus.
4, measured in accordance with the light meter reading machine first shot.
5, refer to the first photos of the exposure, successive reduce exposure until the histogram on the left completely overrun, recorded to reduce the exposure of the series.
6, with reference to the first photos of the exposure, successive increase in the exposure until the histogram on the right completely overflow, increase the exposure of the series record.
7, will increase exposure and reduce the exposure of the sequence together is probably your digital camera's dynamic range.
8, change the camera sensitivity set to repeat treads 4 through 6. In the same digital camera, routinely, while high sensitivity dynamic range than the low sensitivity of the dynamic range slightly lower.
[Conclusion]
With the evolution of technology,
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Accurate exposure a {computer} {ambition} be a dig
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