<s>
The	O
Zorki	B-Algorithm
4	I-Algorithm
was	O
possibly	O
the	O
most	O
popular	O
of	O
all	O
Zorki	B-Algorithm
cameras	O
,	O
with	O
1,715,677	O
cameras	O
made	O
by	O
the	O
KMZ	O
factory	O
in	O
Krasnogorsk	O
,	O
Russia	O
.	O
</s>
<s>
The	O
Zorki	B-Algorithm
4	I-Algorithm
was	O
also	O
the	O
first	O
of	O
the	O
Zorki	B-Algorithm
cameras	O
to	O
be	O
exported	O
in	O
large	O
numbers	O
to	O
the	O
west	O
.	O
</s>
<s>
When	O
the	O
Zorki	B-Algorithm
4	I-Algorithm
rangefinder	B-Algorithm
was	O
introduced	O
in	O
1956	O
,	O
its	O
contemporaries	O
included	O
the	O
Zorki	B-Algorithm
S	O
,	O
Zorki	B-Algorithm
2S	O
,	O
FED	O
2b	O
,	O
Leica	B-Algorithm
M3	I-Algorithm
(	O
introduced	O
two	O
years	O
before	O
)	O
,	O
Leica	O
IIIg	O
,	O
Nikon	O
S2	O
,	O
Canon	O
VT	O
,	O
and	O
Canon	O
L1	O
.	O
</s>
<s>
The	O
Zorki	B-Algorithm
4	I-Algorithm
's	O
production	O
run	O
outlasted	O
all	O
of	O
them	O
.	O
</s>
<s>
When	O
it	O
morphed	O
into	O
the	O
Zorki	B-Algorithm
4K	I-Algorithm
by	O
1973	O
,	O
its	O
contemporaries	O
included	O
the	O
FED	O
4b	O
,	O
Leica	O
M4	O
and	O
M5	O
,	O
Nikon	B-Algorithm
F2	I-Algorithm
,	O
and	O
Canon	B-Algorithm
F-1	I-Algorithm
and	O
Canon	O
Canonet	O
QL	O
17	O
GIII	O
.	O
</s>
<s>
The	O
Zorki	B-Algorithm
4	I-Algorithm
is	O
essentially	O
a	O
Zorki	B-Algorithm
3S	O
with	O
a	O
self	O
timer	O
.	O
</s>
<s>
The	O
Zorki	B-Algorithm
4	I-Algorithm
came	O
in	O
2	O
variants	O
the	O
original	O
which	O
uses	O
a	O
thumb	O
wheel	O
to	O
advance	O
to	O
film	O
and	O
cock	O
the	O
shutter	O
.	O
</s>
<s>
The	O
Zorki	B-Algorithm
4k	I-Algorithm
included	O
a	O
wind	O
lever	O
for	O
easier	O
operation	O
.	O
</s>
<s>
As	O
with	O
other	O
Soviet-era	O
rangefinders	B-Algorithm
,	O
the	O
shutter	O
speed	O
selector	O
rotates	O
when	O
the	O
shutter	O
is	O
released	O
,	O
and	O
should	O
not	O
be	O
changed	O
until	O
after	O
the	O
shutter	O
has	O
been	O
cocked	O
.	O
</s>
