<s>
During	O
the	O
1930s	O
,	O
Zeiss	O
Ikon	O
(	O
ZI	O
)	O
made	O
a	O
wide	O
range	O
of	O
miniature	B-Algorithm
cameras	I-Algorithm
for	O
the	O
35mm	O
film	O
format	O
.	O
</s>
<s>
Among	O
these	O
were	O
the	O
Otto	B-Algorithm
Berning	I-Algorithm
's	O
motor-driven	B-Algorithm
Robot	B-Algorithm
cameras	I-Algorithm
as	O
well	O
as	O
the	O
ZI	O
lever-operated	O
Tenax	B-Algorithm
I	I-Algorithm
and	O
Tenax	B-Algorithm
II	I-Algorithm
.	O
</s>
<s>
The	O
Tenax	B-Algorithm
II	I-Algorithm
is	O
a	O
35mm	O
RF-camera	B-Algorithm
launched	O
by	O
ZI	O
in	O
1938	O
.	O
</s>
<s>
At	O
first	O
it	O
was	O
only	O
called	O
the	O
Tenax	O
,	O
but	O
the	O
following	O
year	O
a	O
quite	O
different	O
and	O
less	O
sophisticated	O
camera	O
with	O
the	O
same	O
name	O
was	O
launched	O
,	O
both	O
designed	O
by	O
Hubert	O
Nerwin	O
,	O
supposedly	O
based	O
on	O
Otto	B-Algorithm
Berning	I-Algorithm
's	O
original	O
idea	O
.	O
</s>
<s>
The	O
1938	O
model	O
is	O
known	O
as	O
mark	O
II	O
,	O
or	O
just	O
the	O
Tenax	B-Algorithm
II	I-Algorithm
,	O
while	O
the	O
simpler	O
1939	O
model	O
,	O
is	O
known	O
as	O
the	O
Tenax	B-Algorithm
I	I-Algorithm
.	O
</s>
<s>
The	O
Tenax	B-Algorithm
I	I-Algorithm
was	O
continued	O
for	O
a	O
while	O
in	O
the	O
1950s	O
in	O
East	O
Germany	O
.	O
</s>
<s>
The	O
Tenax	B-Algorithm
II	I-Algorithm
has	O
a	O
proprietary	O
bayonet	O
lens	B-Algorithm
mount	I-Algorithm
as	O
a	O
provision	O
for	O
using	O
different	O
lenses	O
,	O
but	O
only	O
a	O
small	O
selection	O
was	O
made	O
available	O
during	O
the	O
few	O
years	O
the	O
camera	O
stayed	O
in	O
production	O
,	O
halted	O
by	O
Germany	O
's	O
war	O
efforts	O
.	O
</s>
<s>
A	O
small	O
round	O
window	O
in	O
a	O
lateral	O
extension	O
on	O
the	O
lens	O
barrel	O
is	O
aligned	O
up	O
in	O
front	O
of	O
the	O
camera	O
's	O
right-hand	O
rangefinder	B-Algorithm
window	O
.	O
</s>
