Methods for controlling the Ambient and Strobe Light are different.
When using the
Ambient Light The strobe’s setting does not make any difference.
Camera’s Aperture Value: As the aperture becomes smaller (the “f/ stop” number becomes larger, for example f/8.0 instead of f/5.6), less light passes through the lens and so the amount of exposure decreases (in Manual and Aperture Priority Modes). When using Exposure Compensation with Shutter Priority Mode, the camera’s aperture value will change as well.
Camera’s Shutter Speed: As the speed becomes faster (the fraction becomes smaller, for example 1/125 of a second instead of 1/60), less light passes though the lens and amount of exposure decreases (in Manual and Shutter Speed Priority Modes). When using Exposure Compensation with Aperture Priority Mode, the camera’s shutter speed will change as well.
Strobe Light Directly related to the camera’s aperture setting.
Reference No. 9 Differences between using external strobes with digital cameras and film cameras
Image Sensor Latitude
Compared to silver halide film, consumer grade compact digicams have narrower image sensor latitude and less dynamic range. This means there may be less possible contrast gradations, loss of shadow details, increase of blooming – washout of highlights etc. Accordingly, more precise control of natural light and strobe light is increasingly important.
Image Sensor Size and Lens Focal Length
Because the image sensor size of consumer digicams is small (compared to 35mm film systems), extremely short focal length lenses can be used. And because of this, it is possible to obtain much deeper depth of field (compared to 35mm film at the same view angle and optical aperture).
With conventional 35mm film systems, achieving great depth of field, especially for macro imaging, required some skill and
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Version 1. October 4, 2003 |
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