Today with time on my hands I found I had a set of Wollensak Petzval barrels with the same internal thread as my Alphax #4 shutter.

I took the rear element group of a 305mm Raptar [Dialyte] and put it on the rear tube, [straight fit, exact threads] on the front I left the Petzval front group in its barrel. Between these barrels sits a studio shutter.

The image on the GG is very smooth sharp - a slight glow and nice OF areas.

Combined the lens has a focal length of about 229mm at infinity, the same as the original Petzval.

Meant to add I will take some images over the next day or so.