I found only limited info online about this lens (Apo Naviatr 305mm F9 by DO industries) which i got from a forum member for use on a project which is now almost finished.

I read that DO industries is/was Elgeet, but nowhere is there any info on their LF lenses.
Can anyone shed any light on this?
I know this has a fairly large image circle but wondering if there is an actual number out there?


It seems to be a tessar style lens design...?