[Leica] Allen

[Mark Rabiner <mark@rabiner.cncoffice.com>]

><Snip> 
> There are square screw head fittings and they are called "Robertson". They,
> and their drivers, are commonly available in Canada but I think, due to
> patent restrictions, harder to find elsewhere. If you cannot find the proper
> driver, it would be easy to fabricate one. Perhaps the Wetzlar cameras have
> the Allen fitting and the Midland cameras the Robertson?
> 
> John
> 
><Snip> 

Hasselblad I think makes a back which gives you not square, but hexagonally
shaped pictures!
But they're harder to frame! You need a Van Allen wrench!
Mark Rabiner