Автор: jivkojj
Дата: 07-08-11 00:38
Сега погледнах за Д90, при спотовото мерене, размера е 3.5мм диаметър на избраната фокусна точка. За сравнение при централното мерене размерите са 6, 8, 10мм. Ето това как се намества във визьора:
http://photo-zona.net/images/user61532/album14657/large/1312666392_hssv5222_spotD90.jpg
И малко още информация:
When your D90 is in spot meter mode and you move the AF point to some small section of your subject, you can rest as-sured that you’re getting a true spot read-ing. In fact, you can use your spot meter to determine an approximate EV range of light values in the entire image. You can do this by metering the lightest and dark-est spots in the frame. If this value ex-ceeds 5 or 6 stops diference, you’ve got to decide which part of your subject is most important to you and meter only for it. On an overcast day, you can usually get by with no worries since the range of light values is often within the record-ing capability of the sensor. On a bright sunny day, the range of light exceeds what your sensor can record by as much as two times, which can often be as much as 12 stops, while your sensor can record a maximum of only 6 or 7 stops.Don’t let the numbers make you nervous. Just remember that spot meter-ing is often a trade-of. You trade the highly specifc ability to ensure that a certain portion of an image is “spot-on” for the ability of the camera’s multiple “averaging” skills to generally get the correct exposure throughout the frame. Te choice is yours, depending on the shooting situation. If you spot-meter a person’s face while they are standing in the sun, the shad-ows around that person will contain little or no data. The shadows will be underexposed and look like solid black. Then, if you spot-meter from the shad-ows instead, the person’s face is likely to “blow out” to solid white.
Това го намерих в Mastering the Nikon D90
http://media.buch.de/img-adb/17625588-00-00/mastering_the_nikon_d90_nikonianspress.jpg
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