 BetterPhoto Member |
What is meant by stop-down metering? I have recently purchased a digital SLR. I have an extensive array of manual focus lenses from a different manufacturer which, I have recently learned, can be used on my new digicam with an adapter. The info I am getting refers to "stop-down" metering. Just what is meant by this, and how is it achieved?
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doug Nelson |
You set the aperture on the lens first, small aperture such as f16 for extreme depth of field, large aperture to blur your background. Depending on your camera, you adjust the shutter to bring the needle within the circle, light up the LED's just right,etc OR the camera can select the shutter for you, based on the amount of light coming through the lens aperture. See your camera's instructions for stop-down metering. If you have a Canon, go to google and look for a site under the name of nemeng in Australia. He discusses Canon's attempts to disallow users to do this, suggesting a workaround.
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doug Nelson |
See http://photonotes.org/articles/eos-manual-lenses/#what also, for an explanation of "stop-down".
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Jon Close |
The normal function of your digital SLR is metering with the lens aperture wide open. The lens and camera communicate maximum aperture and other information. When you press the shutter button the aperture closes down to the setting chosen by you or the camera's auto-exposure circuit. When you mount non-compatible lenses the camera has no way of knowing what the wide open aperture is, nor does it have any means to control closing it down to another setting. Stop-down metering means that you meter with the lens aperture manually set (stopped down) to the desired setting. The viewfinder will be darker, a la doing depth of field preview. You then change the shutter speed until the camera meter indicates acceptible exposure. This is the way metering was done with many SLR cameras in the days before open-aperture metering.
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