Is a Planatograph lens convertible?

[athanasius80]

Does anyone know if the Bausch and Lomb Planatograph lenses were convertibles? I know the Plastigmats are, but no one seems to exactly know. Thanks!

 

[RichSBV]

I looked in the "Large Format Optical Reference Manual"...

I see one Plantograph from B&L, an 8 inch f/8 got 5x7. No other info.

But, I also find a Hurlburt-Sheppard Plantograph Symetrical. This is 8 inch f/8 for 5x7, rear cell 16 inch f/11 for 8x10.

There is commonality in name and arperture, so maybe the B&L converts?

I'm sure someone else will know more...