Автор: tantris
Дата: 23-01-09 15:01
Overall Manual Control (3.0)
The Nikon D90 offers nearly every manual control you could ask for to adjust your digital photographs. Unfortunately, the same cannot be said about the camera's video mode. The D90 has too many peculiar manual control quirks—making the entire process of recording video a trial-and-error spectacle.
The D90 has four manual control settings: aperture-priority, shutter-priority, program mode, and manual mode. Aperture-priority allows you to choose the aperture setting, while the camera automatically selects a corresponding shutter speed. Shutter-priority is the same concept, but instead allows for shutter speed adjustment (and the camera automatically chooses an aperture setting). Program mode allows you to select different combinations of shutter speed and aperture together. Manual mode is fully manual and allows you to make all the aperture and shutter speed adjustments yourself. With all these modes, aperture is adjusted by rotating the dial just below the on/off switch on the front of the camera. Shutter speed is controlled by a similar dial on the back side of the camera, where the thumb of your right hand rests. Nikon did an excellent job making these dials and buttons easily accessible and comfortable to use.
The main problem with the D90's manual controls is how so few of them can be manipulated while recording is taking place. Shutter speed, aperture, and ISO all must be adjusted before you begin recording, making only zoom, focus, and exposure adjustment the only available controls while the camera is capturing video.
To further complicate things, you must exit live view mode in order to make adjustments to aperture, ISO, and shutter speed. What is most frustrating about this is the fact that you can still make changes to the settings while in live view mode, but you must exit and reenter the mode in order for those changes to take effect. This can make you think you are adjusting the aperture or shutter speed (as the camera will display number changes on the LCD and in the info box), while no changes have actually taken place.
In live view mode, even with the camera in a fully manual setting, the D90 will still continue to make automatic exposure adjustments (without registering any change in aperture, shutter speed, or ISO). This means you can setup the exact aperture and shutter speed you desire, only to have the entire exposure change when you point the camera to a darker or brighter light source. To get around this problem you need to make use of the auto exposure-lock button (AE-L/AF-L) to the right of the viewfinder. Holding this button maintains a desired exposure no matter how much the lighting within the frame changes. By default, the AE-L/AF-L button must be held down continuously to produce these results, but in the D90's custom settings menu (under f Controls, Assign AE-L/AF-L button) you can set the button to lock and hold the exposure with a single push. While we were able to produce some interesting effects this way, it was clearly too much of a roundabout measure just to get exposure adjustment under control.
Many times, numerous manual features don't seem to produce any different results, even though the camera says they're being adjusted. This adds to the confusion of certain settings not being able to adjust during recording or while live view mode is engaged. Really the only way to see if your changes are having any effect is through trial-and-error.
5Д2 не може ли да снима видео на М?
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