Adjustable focus HD FPV goggles for Connex Prosight or Raspberry Pi HD FPV Broadcast project

These goggles have 2 different versions, on utilizes the Raspberry PI HD broadcast project and a cheap dedicated 5 inch Raspberry Pi screen. The other has a direct HDMI input and is suitable for an HD link such as the Connex Prosight.

I have made the focal length adjustable because none of the off-the shelf goggles I have tried have I been able to get a decent focus for my prescription. I am sure this must be the case for other old people like me! The only modification I have made since doing