Of course, this is assuming that the camera body has a groove and not a ridge. Old can be ridge on camera and groove on film holder and new is groove on camera and ridge on holder. Two grooves or two ridges are a problem.
Of course, this is assuming that the camera body has a groove and not a ridge. Old can be ridge on camera and groove on film holder and new is groove on camera and ridge on holder. Two grooves or two ridges are a problem.
The prevelant film holders of today won out, because the ridges on Koronas tended to wear out or get knocked out after use over time. Every shot wore on the camera. With a holder it only gets stressed when that holder is used. By the way, currently the 4x5 Toyo holders are the most consistent and accurate of any out there in that size.
I may have missed it, but as all image projections are spherical, not flat, you might have tried one at F64 or more. That should have created enough depth of focus to get you closer. But the suggestions above are quite good, anyway.
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