An old thread, but still a big problem for many users of a Technika with an ultra-wide-angle lens.
There were several versions. Just for the 4x5" versions of the Technika there were already at least four.
For Technika II I am not sure if there existed something like that.
For Technika III I'm sure, it had on the rear the connection for rectangular boards without recesses and with smooth edges:
PicFront - TechIII.jpg
From Technika IV to today (the boards with recesses and sloping corners), the rear connection was always identical.
There were three versions.
The older version takes on the front only the flat smooth rectangular boards (81x74mm) of the old Technika 6.5 x 9 cm:
PicFront - old.jpg
PicFront - old2.jpg
PicFront - old3.jpg
The newer and latest version also accepts the modern boards (also 81x74mm) of the 6.5 x 9 cm Technika but with sloping corners and recesses:
PicFront - TechV_Master.jpg
PicFront - V_Master2.jpg
PicFront - V_Master3.jpg
There was another version without the ability to attach boards to it.
It only had a bore for Compur # 00 shutters.
The wide-angle lens was fixed directly to it with the retaining ring:
PicFront - small.jpg
PicFront - small2.jpg
A very similar version existed for the Super Technika IV - Baby Technika - for the format 6.5 x 9 cm. But on the rear it had the connection for small boards (81x74mm).
(sorry, no picture)
For 5x7" also existed several versions.
This one is the last version for standard 4x5" Technika IV V Master boards (96x98mm):
PicFront - 5x7.jpg
PicFront - 5x72.jpg
PicFront - 5x73.jpg
There might be a version for the old 4x5" Technika flat boards (sorry, no picture).
In the last version of the 5x7" Super Technika V, the wide-angle focusing device was already integrated in the camera body.
So what? What do you need something like that for?
Anyone who ever wanted to use a super wide-angle lens on a Technika, will not ask this question.
Such lenses (these are no retrofocus designs!) have to be pushed very close to the film plane if they are to be focused on infinity. Almost right up into the camera body.
In this position, however, the bottom must be folded down so that it does not appear on the picture.
So you can not focus the lens with the built-in bottom distance adjustment, anymore.
To focus these lenses, the front standard is pushed almost to the parking position, down to the parking rail. Now, instead of the lens, the wide-angle focusing device is used. In front of it comes the super wide-angle lens. However, the lens has yet to be installed in a correspondingly smaller board, which connects it with the wide-angle focusing device.
Hmm... sounds complicating, but with the help of the large adjusting screw you can now focus very comfortably.
However, only on the ground glass. There is no possibility for coupling with the optical rangefinder of the camera.
These devices were very expensive, so at the end the design was changed and helicoids were used instead - until today.
This has the disadvantage that if one fiddles around the lens for focusing, often accidentally triggers the shutter or disadjusts the aperture or shutter speed.