Greetings, all -
I'm shooting with a lovely pre-Anniversary 4x5 Speed Graphic with TXP320, loaded into a Graflex Film Magazine. The camera, of course, is a Graflex back, with removable groundglass. The lip and slider on the back are steady; the groundglass is correctly oriented, ground-side toward the lens, there's no fresnel addition. The sheaths in the film magazine are flat. I was doing some vintage-styled portraiture this weekend, focusing on the groundglass, using a loupe, making sure the eyes were tack-sharp. I was wide-open on the aperture, and using a somewhat long guesstimated exposure (about a second +/- for the most part.) There is a little bit of motion blur, but, more egregious than that is the fact that the eyes are not in focus. Rather, on the images, the focus appears to be several inches forward of the eye-plane, on the model's shoulder seam.
Very discouraging, particularly as I don't know any of the standard go-to troubleshooting tips apply here. Any ideas, or am I just going to have to do the "angled fence post" test shot, and manually compensate when I focus with this arrangement? Is there a possibility that a glass plate negative is going to have a different plane than a sheet of film, all other things being equal?
Thanks!
Marc
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