Can I use Norita 66 lenses on the Pentacon, or vice versa?
Norita lenses on the
Given the extreme difficulty in finding a 40mm lens in the Pentacon Six mount, is it possible to adapt the Norita lens and use it on the Pentacon Six?
The simple answer is, unfortunately, no!
There are two reasons:
Pentacon Six lenses on the
A consideration of these two problems leads to the following two conclusions:
However, such an adapter has been produced. I have been told that only three units were made, and one of them can be seen in the photograph of the Norita outfit here (although it was not a Norita item!). It is at the front of the outfit just right of centre.
There are two problems in producing the adapter, and only one of them has been overcome.
The Norita system has a breech-lock ring on the lens
that engages with lugs on the camera body.
Pentacon Six Mount to Norita body ring
A shows the top or front ring. The two arrows point to the same ring, which locks onto lenses with the Pentacon Six mount.
B shows the middle ring, which is not visible from the outside edge.
Note the indent at the top (near the arrow) to locate the Pentacon Six register screw.
C shows a fixed pin in ring B. It acts as a stop when rotating ring A anti-clockwise, so that it stops in the right place to enable insertion of the Pentacon Six mount lens.
It is not an aperture pin.
D shows the bottom or rear ring, which rotates to lock onto the lugs on the Norita body.
Letters refer to same components as in the top view:
A shows the front ring the inner A shows the edge of the lip that holds the lens.
B shows the inner ring.
D shows the rear ring, with its breech-lock bayonet for locking onto the body of the Norita camera.
Note that there are two milled edges: the lower one in this photograph, labelled A, rotates the front (Pentacon Six lens) ring; the higher one in this photograph, labelled D, rotates the rear (Norita body) ring.
|The other problem is that the auto-aperture pin on the
Pentacon Six moves in and out, while on the Norita this pin
moves sideways. It has not been possible to find a way
to transfer this action from the lens to the body.
Therefore, when Pentacon Six mount lenses are used on the
Norita, the auto aperture or diaphragm function is lost:
lenses operate all the time at the aperture selected, which
makes focussing harder. Exactly the same problem
occurs with the (commercially-available!) adapter for using
Pentacon Six lenses on Mamiya 645 cameras, for the same
reason. If someone can find a way of solving this
problem, many Mamiya 645 owners with Pentacon Six lenses
will be interested!
Here is a picture of a Norita 66 with the Pentacon Six lens adapter attached:
And here are two shots of Pentacon Six mount lenses on the Norita
66. In both cases, I have chosen to show Schneider-Kreuznach
Exakta 66 lenses.
The 150mm Tele-Xenar on the Norita
The 75-150mm Variogon Zoom lens on the Norita.
To return to the main Norita page, click here.
To return to the section on the pentaprisms, click here.
To return to the Frequently-asked Questions, click here.
To go back to the introduction to the cameras, click here.
To return to the interview with the author, click here.
© TRA February 2008. Latest revision: July 2016