Years ago I found an Ohnar negative and slide copier in a second-hand store (known as a thrift store in the US I believe). It had an Olympus adapter on it so I bought a Nikkor adapter as I already had a K&F Concept adapter for my Nikkor lenses to fit my Sigma fp L camera. For some unknown reason the photos were not pin sharp focused even though the Ohnar instructions said the built-in lens was low in aperture in order to ensure adequate depth-of-field to give good focus. Plus I had no light source, For these reasons, I decided to build a dedicated arrangement to fit my camera.
I cut up 18mm plywood to give a case for the small LED panel I had bought for this project. I then added small blocks of plywood to act as spacers and alignment stops so having put the camera with the Ohnar tube in place, the blocks had wood glue added and were gently pushed into place ensuring a snug fit.
The two lower panels that meet at right angles are hinged to allow this thing to pack up smaller. The piece that sits vertically was held in place by Blue Tack. That worked well and I didn't need anything more secure especially as I doubt I'll need to use this copier again.
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