I don't think a focusing mechanism is needed for a 47mm lens on 5x4. I was considering hyperfocal focus for my 6x12 format camera with a 65mm lens (link below) but in the end I modified part of an Olympus lens to do the focusing.
What did you use for a viewfinder? I made mine from some spare lens elements.
Steve.
Congratulations, Steve, your 6x12 camera is extremelly well designed and done.
For the viewfinder I used a lens wich you find in apartment doors, I don't know the name for that in english. It has a very wide angle, near 180º. Then, I found a PVC piece, used for conecting gardening irrigation PVC tubes and fixed the lens to it. Then I mounted an acessory shoe piece. This lens on 4x5 has a 120º angle and, as you know a viewfinder for this angle is expensive, so I built this one. The quality of the image, obviously is not great but the purpose of this viewfinder is just framing, I have a ground glass on this camera if I need to frame and compose more accuratelly.
I adjusted the frame with black tape, wich is not what you see on those camera photos, I tried first black paint but the tape is better. Here you have some photos of it.
This is the door viewfinder, as you can see, the screw on front part is very long, wich allows the viewfinder to be mounted on diferent doors thicknesses. This was very important to fix the viewfinder to the PVC device.
This is the PVC device to wich i fixed an accessory shoe piece.
This is the finished Viewfinder, wich I painted mate black and wich needs now a repainting!!!
These PVC tube unions (I don't know the right name for it in english) exists in several sizes, so I choosed one that matches the door viewfinder, I was a bit lucky on this, it looks like it was made for the viewfinder. This costed me a ridiculous 6 !!! And it works!!!