Hello everyone,

I just got my hands on a nice brass lens - R. J. Beck 12 x 10 rectilinear, 16".

Click image for larger version.  Name: 1000_brass_linhoff.jpg  Views: 23  Size: 60.8 KB  ID: 135417

I am trying to get some more information on this lens.
It seems like it is very similar or even identical to a Dallmeyer Aplanat, right?
How old may it be?
In which setup would it typically have been used?

I have no inserts (or whatever they are called), so I'll use it wide open. But it came with a flange.
Already made a board from a sheet of aluminium in Technika-size, so I can use it with adapter-boards on my Linhof Kardan 18x24 and on my 4x5 Sinar F2. For the latter I'd need a massive extension for the bellows and rail to focus it. So this is probably not an option.

Michael