<s>
The	O
Mamiya	B-Algorithm
C	I-Algorithm
series	O
is	O
a	O
line	O
of	O
twin-lens	B-Algorithm
reflex	I-Algorithm
medium-format	O
system	O
cameras	O
manufactured	O
by	O
Mamiya	O
between	O
1956	O
and	O
1994	O
.	O
</s>
<s>
The	O
Mamiya	B-Algorithm
C	I-Algorithm
series	O
was	O
initially	O
aimed	O
at	O
the	O
professional	O
market	O
,	O
but	O
some	O
later	O
models	O
were	O
intended	O
for	O
amateurs	O
.	O
</s>
<s>
Unlike	O
most	O
TLR	B-Algorithm
cameras	I-Algorithm
,	O
the	O
Mamiya	B-Algorithm
C	I-Algorithm
has	O
interchangeable	O
lenses	O
.	O
</s>
<s>
The	O
upper	O
and	O
lower	O
lenses	O
come	O
off	O
as	O
a	O
unit	O
,	O
and	O
are	O
available	O
in	O
at	O
least	O
seven	O
different	O
focal	B-Algorithm
lengths	I-Algorithm
.	O
</s>
<s>
The	O
lower	O
lens	O
of	O
each	O
unit	O
has	O
an	O
aperture	B-General_Concept
diaphragm	O
as	O
well	O
as	O
a	O
leaf	O
shutter	O
.	O
</s>
<s>
Focusing	O
is	O
performed	O
via	O
a	O
bellows	B-Algorithm
system	O
on	O
the	O
front	O
side	O
of	O
the	O
camera	O
.	O
</s>
<s>
Both	O
were	O
the	O
first	O
Mamiya	B-Algorithm
C	I-Algorithm
TLRs	O
that	O
were	O
able	O
to	O
use	O
220	O
film	O
,	O
but	O
a	O
different	O
back	O
was	O
required	O
.	O
</s>
<s>
The	O
C220	B-Algorithm
(	O
April	O
1968	O
)	O
and	O
C330	B-Algorithm
(	O
October	O
1969	O
)	O
models	O
were	O
developed	O
from	O
the	O
C22	O
and	O
C33	O
,	O
respectively	O
,	O
with	O
updated	O
styling	O
(	O
the	O
prominent	O
nameplate	O
now	O
had	O
chrome	O
lettering	O
on	O
black	O
)	O
and	O
a	O
built-in	O
switchable	O
pressure	O
plate	O
to	O
enable	O
the	O
use	O
of	O
220	O
film	O
.	O
</s>
<s>
One	O
of	O
the	O
changes	O
from	O
the	O
C330	B-Algorithm
to	O
the	O
C330f	O
,	O
for	O
example	O
,	O
was	O
the	O
inclusion	O
of	O
a	O
focusing	O
track	O
lock	O
on	O
the	O
latter	O
.	O
</s>
<s>
+Mamiya	O
C	O
twin-lens	B-Algorithm
reflex	I-Algorithm
cameras	I-Algorithm
Name	O
Intro	O
.	O
</s>
<s>
C220	B-Algorithm
1968	O
knob	O
manual	O
C330	B-Algorithm
1969	O
crank	O
automatic	O
?	O
</s>
<s>
Lenses	O
for	O
the	O
Mamiya	B-Algorithm
C	I-Algorithm
series	O
have	O
been	O
grouped	O
by	O
users	O
into	O
three	O
different	O
series	O
based	O
on	O
the	O
shutter	O
model	O
and	O
the	O
color	O
of	O
the	O
shutter	O
housing	O
:	O
first	O
chrome	O
,	O
second	O
chrome	O
,	O
and	O
black	O
.	O
</s>
<s>
+	O
Mamiya-Sekor	O
lenses	O
for	O
Mamiya	B-Algorithm
C	I-Algorithm
TLR	O
Focal	B-Algorithm
length	I-Algorithm
Aperture	B-General_Concept
Chrome	O
Black	O
Optics	O
Filter	O
dia	O
.	O
</s>
<s>
The	O
Mamiya	B-Algorithm
C	I-Algorithm
series	O
were	O
marketed	O
as	O
system	O
cameras	O
,	O
and	O
over	O
time	O
a	O
wide	O
array	O
of	O
accessories	O
were	O
offered	O
.	O
</s>
