Jorge said:Stouffer step wedges....
I understand "Place and Fall" but would metering a gray card and shooting at that exposure be different than your opening up 5 stops?Lee L said:expose in camera to an evenly lit uniform target with the camera focused at infinity, but at 5 stops more exposure than your meter reads for that target. I use a plastic diffusion disk over the lens for even illumination. This 5 stop increase over the meter reading puts the "middle gray" of the step wedge at the right level of exposure, and the other levels "fall" into place.
Lee L said:Bruce,
Opening up 5 stops from the meter reading (which doesn't account for the neutral density in the wedge in contact with the film) puts the middle of the Stouffer scale on Zone V, so you get the full range of the step wedge on film, or at least what part of that range the film/developer can handle.
Lee L said:You don't have to shoot the Stouffer wedges at 1:1 through
the lens. You can use a transmission wedge, put it on top of
the film in the holder, then expose in camera to an evenly
lit uniform target ...
The standard gray scale patches on a MacBeth Color Checker cover reflection densities from 0.05 to 1.50, which is 4.8+ stops. I'm not quite sure what you mean by zones in this context, but if you mean stops, you can certainly get a broader range than 2 or 3 stops with common materials all in the same incident light.darinwc said:I wouldnt think that any reflective surface would provide enough difference to cover more than 2 or 3 zones.
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