While I was at it with the half plate panel there were enough off cuts and pieces to knock up half a dozen MPP lens panels. These are 4inch square with a rear side rebate and sprayed black and varnished. Lens screws in nicely for the moment will get some rubber and jubilee clips to secure.
This is the first Petval I bought off ebay, its got a few chips around the rear glass but we’ll see how it fares on the weekend. Both lenses seem to have the same attributes and coverage.