If you shoot a Wista 45 (mine is an SP), you know the problem. Put a generic Arca-Swiss plate on it and the only thing stopping the camera from twisting is the friction of one 1/4″-20 screw. Bump the camera, lean on a focusing knob, or swing the standard a little hard, and the plate starts to rotate. After enough of that, the screw backs itself out. With a 4×5 field camera hanging off the tripod, that is not a risk I want to take.
So I designed a plate that fits only this camera.
Shaped to the camera, not just screwed to it
The plate is modelled on the bottom of the Wista 45. Its top face has a pocket that takes the metal tripod-mount boss, so the boss carries the clamp load and the plate centres itself on the thread. A band runs along the curved front edge and reaches into the rounded corners, much like the Intrepid plate. That shape locks against the camera’s own outline. Once the screw is tight, the geometry resists the twisting forces, so the screw never sees an unscrewing moment.
Underneath is a standard Arca-Swiss dovetail: 38 mm wide with a 45° undercut, so it works in the clamps most of us already own. The rail runs about 126 mm along the camera, which gives you room to slide the camera back and forth in the clamp to find its balance point. The plate also stops short of the film-back latch, so you can still operate the latch with the plate on.
There are two optional M3 stop-screw holes at the ends of the rail, as on most Arca plates. If you use safety stops, they are there. If you do not, ignore them.
How it was developed
Everything is parametric, built in OpenSCAD and refined in small, measured steps. I started with calipers and photos, then printed test pieces before I committed to a full plate:
- A fit coupon to check the outline against the recess in the camera bottom. This showed that the curve was flatter than my first estimate and that the pocket needed less play. I corrected both.
- A rail coupon to check the dovetail. It snapped into a Peak Design clamp with no contact between the jaws and the body.
- A full plate in PETG, which fitted the camera well and showed that the screw head needed much more room. The access hole is now wider so that you can turn a D-ring or a coin slot easily.
Next step: a machined aluminium prototype
A printed plate proves the fit. The production version will be machined from aluminium. I have prepared a STEP file and a full tolerance drawing for a CNC shop, and the design has a separate setting for metal: tighter clearances, a thinner body, and tapped M3 stop holes. The planned finish is black anodise, to match the camera. I am now getting quotes for the first machined prototype.
Interested?
If you own a Wista 45 and want one of these plates, please contact me. Knowing how many people are interested helps me decide on batch size and price. Contact me at pixelpreaching@gmail.com or use the contact form below.
I am also happy to sell the design files for a small fee if you would prefer to print the plate yourself or have it machined locally. The files include the print-ready STL files, the STEP file and the dimensioned drawing.
Thanks for reading, and happy shooting.
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