Here is a simple overhead view using a Sinar P and 210mm Caltar II lens. I use a Broncolor FCM meter and the film plane probe to determine exposure on Ektachrome 100 film. This is the same system I used for many years in my commercial studio and using transparency film. It is virtually foolproof: first get a midpoint exposure by putting a neutral gray card into the scene, then move the probe to the brightest and darkest parts of the scene you want to have detail. Set both to no more than two stops from middle range exposure. The transparencies will look perfectly exposed. Film plane metering allows for precision control of tonal values and it corrects automatically for errors in shutter speeds, aperture settings, bellows extension and lens falloff. For table top studio work, there is no easier way to set the camera, though you really need a Sinar camera with the patented door that allows for insertion of the probe.
Another still life using film plane metering. Sinar P with the Broncolor FCM meter and probe, on Tmax 100 developed normally. This is more or less the equivalent of using a spot meter for landscape work, with the advantage of correcting automatically for bellows extension, aperture errors, lens falloff and anything else affecting the light actually reaching the film surface.
Here is another example of the precision you can get from film plane metering on 4x5 Ektachrome. I start by putting the probe on a neutral gray card that I place in the scene; this establishes the overall exposure setting. After that, I move the probe to the key highlight and the key shadow, and set the lighting for a maximum plus or minus 2 1/2 stop difference from the midpoint exposure. Once done, there is really no need to bracket exposures; expose a single sheet and you're done.
Wista Rittreck View w/ 4x5 back , Nikkor W 150mm 5.6, Arista Edu 100
scan0231 by Eliverto Scherer, on Flickr
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