<s>
The	O
Nikkorex	B-Algorithm
nameplate	O
was	O
used	O
for	O
a	O
series	O
of	O
35	O
mm	O
film	O
,	O
single-lens	B-Algorithm
reflex	I-Algorithm
cameras	I-Algorithm
sold	O
by	O
Japanese	O
optical	O
manufacturer	O
Nippon	O
Kogaku	O
K.K.	O
,	O
as	O
well	O
as	O
a	O
series	O
movie	O
cameras	O
and	O
movie	O
projectors	O
.	O
</s>
<s>
The	O
Nikkorex	B-Algorithm
35	O
was	O
the	O
first	O
model	O
of	O
the	O
Nikkorex	B-Algorithm
series	O
,	O
produced	O
in	O
1960	O
.	O
</s>
<s>
To	O
keep	O
costs	O
low	O
compared	O
to	O
the	O
flagship	O
Nikon	B-Algorithm
F	I-Algorithm
,	O
the	O
Nikkorex	B-Algorithm
35	O
used	O
a	O
fixed	O
four-element	O
Nikkor-Q	O
5cm	O
2.5	O
lens	O
instead	O
of	O
an	O
interchangeable	O
F-mount	O
;	O
a	O
Citizen	O
MVL	O
leaf	O
shutter	O
instead	O
of	O
a	O
Leica-inspired	O
focal	O
plane	O
shutter	O
;	O
a	O
fixed	O
,	O
mirror-based	O
viewfinder	O
and	O
fixed	O
focusing	O
screen	O
instead	O
of	O
a	O
glass	O
pentaprism	O
;	O
no	O
instant-return	B-Algorithm
mirror	I-Algorithm
mechanism	O
or	O
mirror	O
lock-up	O
option	O
;	O
no	O
provision	O
for	O
motor	O
drives	O
;	O
and	O
lesser	O
build	O
quality	O
.	O
</s>
<s>
Controls	O
for	O
meter-coupled	O
aperture	B-General_Concept
,	O
shutter	O
speed	O
and	O
film	O
speed	O
settings	O
are	O
on	O
rings	O
around	O
the	O
lens	O
.	O
</s>
<s>
The	O
Nikkorex	B-Algorithm
35	O
II	O
introduced	O
in	O
1962	O
,	O
was	O
a	O
revision	O
of	O
the	O
Nikkorex	B-Algorithm
.	O
</s>
<s>
The	O
name	O
"	O
NIKKOREX	B-Algorithm
"	O
was	O
also	O
printed	O
on	O
the	O
front	O
of	O
the	O
meter	O
lens	O
.	O
</s>
<s>
The	O
Nikkorex	B-Algorithm
F	O
,	O
introduced	O
in	O
1962	O
,	O
was	O
the	O
second	O
interchangeable-lens	O
SLR	B-Algorithm
sold	O
by	O
Nikon	O
,	O
but	O
it	O
was	O
manufactured	O
by	O
Mamiya	O
.	O
</s>
<s>
Along	O
with	O
dropping	O
the	O
leaf	O
shutter	O
design	O
of	O
the	O
other	O
Nikkorex	B-Algorithm
products	O
,	O
the	O
Nikkorex	B-Algorithm
F	O
was	O
the	O
first	O
production	O
camera	O
to	O
use	O
the	O
Copal	O
Square	O
shutter	O
,	O
a	O
rugged	O
design	O
used	O
in	O
many	O
future	O
cameras	O
by	O
Nikon	O
and	O
other	O
manufacturers	O
.	O
</s>
<s>
The	O
shutter	O
also	O
offered	O
a	O
faster	O
flash	O
sync	O
speed	O
of	O
1/125th	O
of	O
a	O
second	O
compared	O
to	O
the	O
Nikon	B-Algorithm
F	I-Algorithm
.	O
Along	O
with	O
a	O
different	O
shutter	O
,	O
the	O
Nikkorex	B-Algorithm
F	O
used	O
a	O
hinged	O
back	O
for	O
more	O
convenient	O
film	O
loading	O
.	O
</s>
<s>
In	O
1965	O
,	O
the	O
first	O
of	O
the	O
Nikkormat	B-Algorithm
series	O
was	O
introduced	O
,	O
a	O
Nikon-built	O
amateur	O
market	O
camera	O
using	O
a	O
Copal	O
Square	O
shutter	O
.	O
</s>
<s>
The	O
Nikkorex	B-Algorithm
F	O
was	O
discontinued	O
in	O
1966	O
,	O
and	O
Mamiya	O
sold	O
the	O
design	O
to	O
Ricoh	O
,	O
which	O
produced	O
the	O
related	O
Ricoh	O
Singlex	O
and	O
Sears	O
SL11	O
.	O
</s>
<s>
The	O
Nikkorex	B-Algorithm
Zoom	O
35	O
was	O
a	O
variation	O
on	O
the	O
Nikkorex	B-Algorithm
35	O
II	O
.	O
</s>
<s>
Released	O
in	O
1963	O
,	O
the	O
Zoom	O
35	O
shares	O
the	O
Nikkorex	B-Algorithm
35	O
II	O
's	O
distinctive	O
nameplate	O
mounted	O
to	O
a	O
black	O
selenium	O
cell	O
meter	O
.	O
</s>
<s>
Instead	O
of	O
a	O
50mm	O
lens	O
,	O
the	O
Nikkorex	B-Algorithm
Zoom	O
35	O
has	O
a	O
fixed	O
43-86mm	O
3.5	O
lens	O
that	O
is	O
a	O
predecessor	O
to	O
the	O
Nikkor	O
F-mount	O
43-86mm	O
lens	O
released	O
later	O
in	O
1963	O
.	O
</s>
<s>
Like	O
the	O
earlier	O
fix-lens	O
Nikkorex	B-Algorithm
models	O
,	O
virtually	O
all	O
control	O
of	O
the	O
camera	O
was	O
done	O
using	O
rings	O
on	O
the	O
lens	O
.	O
</s>
<s>
Shutter	O
speed	O
,	O
aperture	B-General_Concept
,	O
film	O
ASA	O
(	O
ISO	O
)	O
number	O
,	O
zoom	O
and	O
focus	O
each	O
had	O
a	O
control	O
ring	O
on	O
the	O
lens	O
,	O
while	O
only	O
the	O
shutter	O
release	O
and	O
film	O
wind	O
were	O
on	O
the	O
camera	O
body	O
.	O
</s>
<s>
The	O
Nikkorex	B-Algorithm
Auto	O
35	O
was	O
a	O
new	O
design	O
replacing	O
the	O
Nikkorex	B-Algorithm
35	O
II	O
.	O
</s>
<s>
New	O
features	O
included	O
a	O
48mm	O
2.0	O
Nikkor	O
lens	O
,	O
a	O
new	O
instant	B-Algorithm
return	I-Algorithm
mirror	I-Algorithm
design	O
,	O
improved	O
pentaprism	O
viewfinder	O
and	O
a	O
shutter	B-Algorithm
priority	I-Algorithm
auto-exposure	O
mode	O
.	O
</s>
<s>
Nikon	O
offered	O
a	O
series	O
of	O
movie	O
cameras	O
and	O
projectors	O
using	O
the	O
Nikkorex	B-Algorithm
name	O
from	O
1960	O
to	O
1965	O
.	O
</s>
