Measuring light and light compensation for Lens nikkor
Optical measurement is measuring the light quantity required to make the film image. Light volumes need to be in the form of speed Chatters. (Period Chatters open to light through the film) and Aperture (open box in the lens nikkor allows light to pass) is done using optical measurement devices called light-Meter (Light Meter) which may is in a camera or mobile phone.
Meter light will include light measurement cell (typically a Silicon Photocell) in which light reflected from the object. This is called a meter. Another that reflects light Meter. These cells measure light exposure metrics like the object that will reflect any light out or 18% compared to a medium gray (case คิดถึง Monochrome If the color is neutral colors, color) white light will reflect about 100% black is about 0% reflective light from the temple area, whether white or black light meter to measure the value out. gray Same medium. If you want to color correct it. Help offset the use of light. (To be mentioned later) for other color is the same principle is to trade Meter colors, neutral colors.
Exposure compensation value is to modify the light meter to read the light value. Is correct. Principle is simple, if measured from the black light meter. Value for light to medium gray than black, will softening. If you want to be black is to reduce glare from the information value. Grayed out when you get less light it will be black if measured contrast of white light meter will cost to light gray for the same medium. If you want a white color, soft gray over medium to add it. To light gray. Light gray when it is added it will be white. For other color is the same principle but instead of a gray medium is a medium tone color, such as medium blue, medium red, medium green.
- When using a photo-fit exposure value would suggest that cameras have different color of white, black, gray out a gray medium. We do not want to be like that.
- If you want to white out to be white. Black out black. It must compensate for light For white light is offset to the positive 2 stop (to increase light and the dark is light to compensate for the negative 2 stop (to reduce glare, the image
When it comes to measured light to talk about light measurement system. The lighting system will be measured for several systems in different systems is the main measure average heavy medium light, spot light measurement systems, light measurement systems, multi-section In addition, some cameras have optical measurement system with the specific details of each system is
- Measure the average light medium heavy. Cell is measured from light to light reading, but will emphasize all of the average image from a central core area (approximately 60-80% of the cells measured Wash light) meter reading is a medium gray. Must be offset with light.
- Measure light locally. Is similar to the average mid heavy but light meter to measure the cells using a central image. Not very large area. Measured only in light (approx. 8-10%) to the meter reading is a medium gray. Must be offset with light.
- Spot light measurement system. Same spot, but the system will use smaller cell areas measured in the light reading light (approximately 3% or less) to the meter reading is a medium gray. Must be offset with light.
- Measurement of multiple light. Meter reading will measure the light of all the cells. And it will calculate values for the light is focused by the Area of the image. (Usually the area that match the active focus point), this system will provide more accurate exposure values without the need to compensate for lighting except some cases such as back light photography. Or an image brightness of each area varies significantly as well as shaded areas and face the sun.
