<s>
The	O
Retina	O
line	O
included	O
a	O
variety	O
of	O
folding	O
and	O
non-folding	O
models	O
,	O
including	O
the	O
Retina	B-Algorithm
Reflex	I-Algorithm
single	B-Algorithm
lens	I-Algorithm
reflex	I-Algorithm
camera	I-Algorithm
.	O
</s>
<s>
Kodak	O
AG	O
also	O
offered	O
a	O
companion	O
line	O
of	O
less-expensive	O
Retinette	B-Algorithm
cameras	O
,	O
with	O
similar	O
looks	O
and	O
function	O
.	O
</s>
<s>
While	O
the	O
previous	O
photohistorical	O
literature	O
gave	O
both	O
a	O
pre-war	O
3-digit	O
"	O
Type	O
"	O
code	O
for	O
each	O
Retina	O
and	O
Retinette	B-Algorithm
model	O
and	O
a	O
post-war	O
3	O
digit	O
"	O
Type	O
"	O
code	O
for	O
each	O
Retina	O
or	O
Retinette	B-Algorithm
model	O
,	O
recent	O
research	O
indicates	O
that	O
the	O
term	O
"	O
Type	O
"	O
can	O
only	O
be	O
found	O
for	O
the	O
post-war	O
Retina	O
and	O
Retinette	B-Algorithm
cameras	O
in	O
the	O
contemporary	O
Kodak	O
AG	O
documents	O
.	O
</s>
<s>
code	O
was	O
used	O
for	O
all	O
Kodak	O
AG	O
cameras	O
,	O
not	O
just	O
the	O
Retina	O
and	O
Retinette	B-Algorithm
models	O
.	O
</s>
<s>
So	O
,	O
in	O
the	O
interest	O
of	O
historical	O
accuracy	O
,	O
pre-war	O
Retina	O
and	O
Retinette	B-Algorithm
cameras	O
have	O
a	O
"	O
Nr.	O
"	O
</s>
<s>
code	O
and	O
post-war	O
Retina	O
and	O
Retinette	B-Algorithm
cameras	O
have	O
a	O
"	O
Type	O
"	O
code	O
.	O
</s>
<s>
The	O
fifth	O
and	O
final	O
generation	O
of	O
folding	O
Retina	O
cameras	O
(	O
with	O
capital-letter	O
B	O
or	O
C	O
suffix	O
)	O
was	O
introduced	O
in	O
1957	O
,	O
the	O
same	O
year	O
as	O
the	O
Type	O
025	O
Retina	B-Algorithm
Reflex	I-Algorithm
system	O
.	O
</s>
<s>
The	O
Retina	B-Algorithm
Reflex	I-Algorithm
SLR	B-Algorithm
camera	I-Algorithm
systems	O
were	O
introduced	O
in	O
1957	O
and	O
produced	O
in	O
several	O
iterations	O
to	O
1966	O
.	O
</s>
<s>
The	O
first	O
model	O
,	O
Type	O
025	O
Retina	B-Algorithm
Reflex	I-Algorithm
,	O
shared	O
the	O
"	O
C	O
"	O
series	O
interchangeable	O
front	O
element	O
lenses	O
with	O
the	O
interchangeable	O
Type	O
020	O
Retina	O
IIc	O
and	O
Type	O
021	O
Ausf	O
I	O
Retina	O
IIIc	O
(	O
35mm	O
,	O
50mm	O
,	O
and	O
80mm	O
)	O
.	O
</s>
<s>
Type	O
025	O
Retina	B-Algorithm
Reflex	I-Algorithm
had	O
the	O
same	O
uncoupled	O
single	O
range	O
exposure	O
meter	O
of	O
the	O
Type	O
019	O
Ausf	O
I	O
Retina	O
IB	O
and	O
the	O
Type	O
021	O
Ausf	O
.	O
</s>
<s>
The	O
second	O
generation	O
Type	O
034	O
Retina	B-Algorithm
Reflex	I-Algorithm
S	O
of	O
1959	O
shared	O
"	O
S	O
"	O
type	O
lenses	O
with	O
the	O
Type	O
027	O
Retina	O
IIIS	O
(	O
below	O
)	O
,	O
and	O
offered	O
fully	O
coupled	O
metering	O
.	O
</s>
<s>
At	O
this	O
point	O
economical	O
Japanese	O
SLRs	B-Algorithm
were	O
becoming	O
available	O
and	O
the	O
Nikon	O
F	O
of	O
1959	O
would	O
set	O
the	O
standard	O
for	O
future	O
camera	O
system	O
.	O
</s>
<s>
From	O
1968	O
to	O
1974	O
Kodak	O
AG	O
produced	O
an	O
Instamatic	B-Algorithm
Reflex	O
(	O
SLR	B-Algorithm
)	O
based	O
on	O
the	O
Retina	B-Algorithm
Reflex	I-Algorithm
,	O
accepting	O
the	O
S	O
series	O
lenses	O
,	O
but	O
using	O
instamatic	B-Algorithm
126	O
film	O
cartridges	O
and	O
instamatic	B-Algorithm
style	O
flash	O
cubes	O
.	O
</s>
<s>
The	O
IIIS	O
Type	O
27	O
had	O
interchangeable	O
lenses	O
;	O
however	O
these	O
used	O
the	O
S-Type	O
series	O
lenses	O
of	O
the	O
Retina	O
later	O
Reflex	O
SLRs	B-Algorithm
rather	O
than	O
the	O
more	O
limited	O
C	O
series	O
used	O
by	O
the	O
later	O
folders	O
.	O
</s>
<s>
The	O
IIS	O
was	O
slightly	O
smaller	O
(	O
Retinette	B-Algorithm
frame	O
)	O
with	O
similar	O
features	O
but	O
did	O
not	O
have	O
interchangeable	O
lenses	O
.	O
</s>
<s>
Kodak	O
also	O
manufactured	O
the	O
Retinette	B-Algorithm
series	O
of	O
lesser-featured	O
cameras	O
from	O
1939	O
to	O
1960	O
in	O
a	O
variety	O
of	O
folding	O
and	O
rigid	O
models	O
.	O
</s>
