Hi,
I have a few questions relating to my Photovision Target, light meter, Adobe ACR (CS2), and B&W UV filter.
Tonight I checked to see how accurate my light meter and camera (Canon 20D) combination are. I took several pictures of the target, using the settings from the light meter, with and without the UV filter on.
I discovered that the UV filter has almost no affect upon the exposure. That is, when I compare the histograms for the filter on and the filter off using the same manual settings, the histograms are almost indistinguishable. That's good.
I also discovered that my light meter and camera combination seem to be aligned. I can use my light meter settings without having to factor in a calibration factor.
My question concerns Adobe's ACR. When I open the RAW files, I notice that the "brightness" is automatically set at +50. The histogram from the brightness setting at +50 corresponds well to my camera's histogram. If I reduce the brightness to 0, then the histogram is markedly different from that of my camera's. Am I correct to assume that +50 is a default setting?
Continuing on with the brightness setting, how does the Brightness setting differ from the Exposure setting? One oddity that I noticed is that when I increased the brightness and pushed the histogram off scale to the right (too bright), I didn't get the blown out highlights. I have the "Preview", "Shadows", and "Highlights" boxes all checked. However, when I increased the exposure, I blew out the highlight easily. I am curious as to the major difference between Brightness and Exposure settings and how they should be used.
I would appreciate your thoughts on my questions.
Regards,
Kevin
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