Exposure Meter and Automatic cameras Come out, the Process of making the right Choice Getting the Exposure Simple and convenient. Degree of Exposure to the Energy Meter Material of Light Intensity on the subject, and the Aperture and the Readings Shutter Speed Show. Incident Light Meter basically be divided into two categories-and reflection. Incident-light meter to measure the projects directly to the subject matter on the amount of light, easy to use, as long as the light meter on the front of the subject matter, and the translucent sheet facing the camera lens hemisphere, and can be based on indicating Exposure. Incident-Light form the Biggest drawback is that IT is impossible to measure the amount of Light reflected from the Main body, and the major role in the Film, the amount of Light, but IT is this Part. In addition , the use of this Light Meter CASIO Exilim EX-S100 Charger , and sometimes impossible to Close the Main Photographer for Metering, sometimes more than the Principal Balance, of which - some is in Shadow, the incident-Light Meter Will Play a role to be difficult. Reflective Light Meter Measuring the Light reflected by the subject matter. The Machine measured the Camera Light Table, often Reflective, as long as the Light Meter used to measure the direction toward the can. But IT also has some problems. Most of the Reflective Light Meter Measuring the angle is very wide, especially if your subject around the light or dark, then light meter would be "fooled" to provide false information on exposure, resulting in inadequate or excessive body exposure. Now, although there are some reflective light meter can measure a small range, some of the built-in camera light meter also have this "key" performance measurement, to avoid reflecting the average light meter in too bright or too dark background reflection errors caused , but we need the user move a bit brain. Suppose there is a Picture in a Black body, an Intermediate Gray White body and a body. If the Gray Reflective Light meters measure of the subject, which provide an Exposure Will Reading, for example, l/125 sec, F8; If you Go to the main measurement of the white, more amount of light will be reflected to the metering body, Therefore, too little light meter will provide the exposure, such as 1 / 125 sec, F16; go measure the black body, more exposure will be recommended, such as 1 / 125 sec, F4. In this case, How to Choose which Data to the Screen as the correct Exposure Reading IT? Experience has shown that Measurement should be selected from the Gray of the Main Exposure Readings. This is because the Tuning Meter Suitable for the Middle Gray is subject. Regardless of the measured reflected Light source, as long as the Readings according to their Exposure to Film, the resulting photographs in question was Will Gray Tone. If the readings according to the main exposure of the gray, then gray will be the subject presented in the original photo gray, black body because of less amount of light entering the photo will show black and white into the main body due to more more than the amount of light, so it looks lighter or white. If the readings according to the black body exposure, the exposure of the entire screen will be provided by the subject than the gray level increases the aperture, thus the black body will be showing in the photo gray, As for the gray body and white body , the more because of the amount of Light reflected become very White and very Bright, SO that the entire Picture is overexposed. Similarly, White subjects such as Reading according to the Exposure, the Exposure Will be provided than the two narrow Gray of the Main aperture readings, therefore, the main body of the white will become gray in the picture, while the main body of the gray and black, due to enter showing a smaller amount of light and black or dark gray, the whole picture will be underexposed. Thus, if the use of reflective light meter to get the correct exposure when you want, it will take some time to think, to identify the middle of the screen are the main colors, use it as a weighted basis, and then measure the screen go dark and the most the brightest parts and compare them with the middle tone to ascertain the level of their preservation. L · American photographer Jacobs summarized the use of light meter metering error may result in three cases, and proposed solutions: "The first is backlighting. The background light intensity, the subject is dark, according to the measured light exposure can cause underexposure table. At this point the method can adjust the aperture manually, open the aperture or slow down the shutter speed on the line, or add auxiliary lighting. "The second situation is the background light. Shooting bright objects. For example shooting in front of a white wall or the snow-covered courtyard in white people. Such as by the exposure meter readings, it will seem casio np-20 battery insufficient. The reason is simple because the meter would have seen it all white reflectivity of 18% in gray. Of course, no one wants to put the snow turned into a gray color, so the transfer should be a large one aperture, or slow down - block Caixing. Some photographers often deliberately underexposed Snow making, that in order to make a Good Snow, IT is not true. "The Third factor is the Stability Dark background, the subject is also Dark. At this Point the Processing method and the First case the opposite. Covered with Dark Cloth on the Table, on which stood a cover of the Black Book, as instructed by the Exposure Meter, wallpaper and books Will be Gray, SO level should be the Exposure Adjustment Small Aperture, Shutter Speed into the Improve a File. " Although modern Fully Automatic Camera, Easy to operate, the most Advanced Metering System through the Lens and can even Cope with difficult situations such as backlighting, but the Choice of the Exposure is Still a skill. It involves the Photographer's Personal preferences and style, rather than a precise technology can be used to substitute. Vince photographer Yuehan Yi said: "manual metering is still great potential. Also, you can manually take the initiative to carry out exposure control." Evans said: "Manual mode means the photographer is the aperture and shutter speed, photo, such as light or the subject has changed, it must be one or both of manual adjustments. "Film speed, light intensity, shooting moving body, to prevent camera shake, and the depth of field all affect the choice of shutter speed and aperture. To use in bright light IS0100/21. Film photography, take F8, 1 / 125 second exposure for the typical cases, the choice of aperture and casio np-60 battery speed, you need the camera's vibration, the subject of the motion state and the depth of field into account. "If the use of standard 50mm lens, 3 / 125 second shutter speed can prevent camera shake, but if you use the 200mm lens, the image may be blurred, and 1/.125 second shutter speed such as cars will not be fast solidification subject movement. * with 28-200mm lens to F8 shooting, the normal depth of field, however, some images need to have clarity, to deep and clearly visible, yet the atmosphere light. "To meet these special requirements, F8, I/125 second exposure, you need to be adjusted; To prevent camera shake prices, select F4, 1 / 500 sec; to freeze the action, select F2.8, 1 / 1000 sec; as achieve the greatest depth of field, select F22, 1 / 15 seconds. "each of these combinations are equal exposure, because any change in the shutter speed to change the aperture by the corresponding compensation: 1 / 500 sec is 1 / 125 sec 1 / 4, and F4 is the F8 4 times, and SO on. This principle is known as the Law of equivalent Exposure, which is often wrongly used the 'reciprocity Law'. " Evans also pointed out: "must understand that the correct exposure is appropriate combination of shutter speed and aperture. This is the aperture priority, shutter speed priority and a variety of programmed automatic exposure modes for all the basic principles behind, and manual exposure, you can provide freedom of choice. " British photographer John Wilmot said: "In general, all kinds of exposure is a compromise, but the most important part of the image exposed correctly, can often be greatly improved picture quality." Wilmot noted that normally photography, "whether it is approaching the subject metering,casio np-40 battery spot metering or the use of tables, can be carried out in accordance with the shadow or bright light exposure, resulting in different results. In order to accurately determine according to which part of the image exposure, the need for sharp vision and experience. " Part by Light Exposure, Will Show a Bright Part of the details, but some Will be very Dark Dark Shadows and even become, the Whole Picture Will appear underexposed. For example, the Sun Shining on the Sea, this Part of the difference in brightness Prospect of several levels than the Aperture. At this Point, according to the Exposure may cause the Outlook a Little Panoramic lack of Exposure, and most of Sunlight Shining on the water Will be Lost. Reduce the Exposure Will highlight of ALL of those Little Points Light to Help Show the details of the Sky. This Prospect Will become Darker, but the overall effect Will be added. Wilmot believes that the right to reduce Exposure, CASIO EX-Z75 Charger and sometimes very Get Good Results. For example, as the background Shooting a White Tree statue, take the average, although the exposure is appropriate, but if the reduction of an aperture, the bright objects will truly stand out on a dark background. Sometimes, a Simple Landscape may also affect the Bright Sky Light Meter Readings, SO the Exposure Time is Too short and destroyed the effect. Wilmot Easily that this problem is solved by Way of Metering to the Camera Lens is Slightly Down. When the Screen has a Special Part of the Bright, Bright such as buildings, BEACHES, water in Light or Dark background of the subject, generally, the Picture is Too Dark. In order to Obtain an acceptable result, as Far as possible in the Metering necessary to exclude the brightest part. Wilmot that the Exposure Control can also SO that the Screen there are different Tones. Can add a High-profile Picture of Elegance and Lightness, and Low-Key may have Dramatic effects and Heavy Atmosphere. Lighting should be fairly Uniform High-profile to avoid Shadows, and used in the Bright Part Exposure should be able to Get the details as much as possible, this usually means Slightly overexposed. Low-profile photo shoot is Better to use the Side Light, Easy to cause a Small amount of Light Part and slightly underexposed. As the concentration of color photos, generally Slightly Adjust the Exposure and can be Significantly Improved. For color negative Film, the excellent Accuracy of the Exposure concentration or through the scene to Get a Little overexposed. Lack of Exposure tend to make the color Gray and Flat and are overexposed Too Easily Deep and Pale color. Color Film is the same Reason reversal, but on the contrary, less than Half the Exposure profile can thicken and make the Colors more vivid. British Photographer T · Woodcock Introduced High contrast the treatment of subject, particularly Exposure to the subject by the strong Side Light techniques, the Key is to try to measure the highest and lowest Readings Readings. Taking Part First Light and CASIO Exilim EX-S770BE Charger Shadow were measured Parts of the Reading test taken should Pay attention to Fill the Metering Light or Shadow Parts of the Range, then the value between the two Readings were exposed. For example: Reading Light Parts: 1 / 500 sec, F8; Shadow Parts of the Reading: 1 / 30 sec, F8 Exposure Value: 1 / 125 sec, F8. If the Main subject is Too Small, and much Darker or brighter than the background is much more to take the Reading test should be noted that the background could not be subject to undue influence. approached the subject or approach is to use Telephoto Lens Metering. This measured value, usually referred to as "critical" Reading. If the subject is in Motion or inaccessible, then a Feasible Alternative is measured Readings. The most convenient and commonly used method is to measure the reading back of the hand to take their own. Woodcock believes that the problem belongs to contrast the backlight Illumination over Freshman class. When these Shooting Scenes, the easiest Way is to Re-Adjust the Picture, do not let the Light appear in the Screen, and make sure there is no Glare on the Lens, and then measured the Reading, Re-composition, to add a File-Half to two Steps of Exposure Exposure to the Half. Another more accurate approach is to Remember that the Normal reflected Light Readings, and then measured from the Back of the hand to take their own; an alternative reading, according to the median of the two readings exposure. Woodcock also summarizes a few tricks to achieve the correct exposure s 1. Take Readings in the test, First Look at whether they can accurately estimate the Exposure. 2. Usually Pay attention to Save the Battery. If found defective, and Forgot to bring the Battery Meter may be the Shutter Speed ISO Sensitivity value in the Last Film, Film is such 1S0100/21. , Put the Shutter Speed of 1 / 100 second, in the sunny photographs, slides with the F16, negative with the F11. 3. Will seriously affect the Candle Light Meter, IT should be appropriate to the Lens shading. 4. Telephoto Lens to try to measure 11 as the Point-Light Table use. 5. In the Dim Light Meter Readings can not be displayed, you can Turn the Film Speed index Plate, the ISO value is Increased, until the Light Meter Readings showed up. Then Increase the Exposure value, such as on a large Aperture. Value for each doubling of ISO sensitivity, aperture to open a large level. 6. The use of Ultra Wide-Angle Lens to take Pictures,CASIO Exilim EX-S600SR Charger must use the standard Lens Metering First, and then put on Ultra Wide-Angle Shots. 7. Dim Light using reversal Film, the Exposure should be less than Half File to a File in order to maintain the color saturation. Canadian artist and photographer renowned photographer Freeman Patterson, writing home that novice photographers to "learn the correct way of exposure is to study carefully the subject of tone, to look in all circumstances to make the right judgments. Must be good at different composition than the 'average brightness of the' high or arrived first, second and third gear is what effect, This requires repeated practice. Even after a Lot of practice may not be familiar, but the Total Light Meter to Help you Understand the instructions, and Understand only the First STEP to Achieve the correct Exposure. "He said:" If you can truthfully identify the subject in different Parts of Reflective Volume or by the amount of Light, then you are likely to CHANGE the Lens or Aperture, Exposure SO that can reflect your Feelings on the subject. " In short, the correct Exposure for the subject, not only rely on subjective factors, but also rely on objective factors. To Learn How to identify or estimate the subject's color or contrast, then Light Meter Data, and then Adjust the Shutter and Aperture, or by highlighting the Dark Tones to Achieve the desired Exposure. 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