<s>
All	O
the	O
Cosina	B-Algorithm
Voigtländer	I-Algorithm
Bessa	O
models	O
have	O
a	O
double	O
focal-plane	O
shutter	O
with	O
two	O
sets	O
of	O
curtains	O
to	O
prevent	O
damage	O
by	O
the	O
sun	O
.	O
</s>
<s>
This	O
was	O
a	O
finderless	O
body	O
with	O
a	O
Leica	B-Algorithm
screw	I-Algorithm
mount	I-Algorithm
.	O
</s>
<s>
It	O
could	O
of	O
course	O
mount	O
all	O
the	O
wide	O
variety	O
of	O
39mm	O
screw	O
lenses	O
by	O
manufacturers	O
as	O
diverse	O
as	O
Leica	O
,	O
Canon	O
,	O
Nikon	B-Algorithm
and	O
even	O
cheaper	O
but	O
often	O
excellent	O
Soviet	O
lenses	O
.	O
</s>
<s>
On	O
some	O
markets	O
,	O
the	O
Voigtländer	O
Bessa-L	O
was	O
sold	O
as	O
the	O
Cosina	B-Algorithm
107-SW	I-Algorithm
.	O
</s>
<s>
The	O
Bessa-L	O
was	O
supplemented	O
in	O
2001	O
by	O
the	O
Bessa-T	O
,	O
which	O
used	O
the	O
Leica	B-Algorithm
M-mount	I-Algorithm
,	O
could	O
receive	O
a	O
trigger	O
advance	O
design	O
,	O
and	O
had	O
an	O
integrated	O
rangefinder	O
with	O
high	O
magnification	O
,	O
but	O
no	O
viewfinder	O
.	O
</s>
<s>
In	O
2001	O
,	O
the	O
Bessa-T	O
was	O
sold	O
in	O
a	O
special	O
kit	O
,	O
called	O
Heliar	B-Algorithm
101st	O
Anniversary	O
(	O
in	O
short	O
"	O
T101	O
"	O
)	O
,	O
with	O
a	O
50mm	O
f:3.5	O
collapsible	O
Heliar	B-Algorithm
lens	O
,	O
for	O
the	O
anniversary	O
of	O
the	O
Voigtländer	O
Heliar	B-Algorithm
lens	O
design	O
.	O
</s>
<s>
The	O
Bessa-R	O
,	O
introduced	O
in	O
2000	O
,	O
was	O
a	O
rangefinder	O
camera	O
with	O
a	O
projected	O
frame	O
finder	O
and	O
a	O
Leica	B-Algorithm
screw	I-Algorithm
mount	I-Algorithm
.	O
</s>
<s>
Although	O
considerably	O
cheaper	O
than	O
a	O
Leica	B-Algorithm
M	I-Algorithm
camera	O
,	O
its	O
viewfinder	O
was	O
comparable	O
in	O
function	O
and	O
feeling	O
.	O
</s>
<s>
All	O
in	O
all	O
it	O
was	O
an	O
inexpensive	O
,	O
all-manual	O
rangefinder	O
with	O
TTL	O
metering	O
at	O
a	O
significantly	O
lower	O
price	O
than	O
a	O
comparably	O
equipped	O
Leica	B-Algorithm
M	I-Algorithm
camera	O
.	O
</s>
<s>
It	O
was	O
an	O
updated	O
version	O
,	O
with	O
a	O
Leica	B-Algorithm
M-mount	I-Algorithm
replacing	O
the	O
Leica	B-Algorithm
screw	I-Algorithm
mount	I-Algorithm
,	O
and	O
the	O
ability	O
to	O
take	O
the	O
same	O
trigger	O
advance	O
accessory	O
as	O
the	O
Bessa-T	O
.	O
Its	O
quality	O
of	O
fabrication	O
and	O
overall	O
finish	O
was	O
much	O
better	O
than	O
the	O
R	O
,	O
with	O
magnesium	O
alloy	O
replacing	O
the	O
former	O
model	O
's	O
plastic	O
plates	O
and	O
a	O
more	O
substantial	O
cast	O
(	O
as	O
opposed	O
to	O
pressed	O
)	O
metal	O
film	O
rewind	O
lever	O
.	O
</s>
<s>
The	O
Bessa-R2S	O
and	O
Bessa-R2C	O
are	O
special	O
versions	O
of	O
the	O
Bessa	O
R2	O
,	O
introduced	O
in	O
2002	O
,	O
the	O
Bessa-R2S	O
having	O
a	O
Nikon	B-Algorithm
rangefinder	I-Algorithm
mount	I-Algorithm
and	O
the	O
Bessa-R2C	O
a	O
Contax	O
rangefinder	O
mount	O
.	O
</s>
<s>
At	O
about	O
the	O
time	O
in	O
2005	O
when	O
discontinuation	O
of	O
these	O
two	O
models	O
was	O
announced	O
,	O
the	O
Bessa-R2S	O
was	O
also	O
available	O
in	O
a	O
"	O
Nikon	B-Algorithm
Historical	O
Society	O
"	O
(	O
NHS	O
)	O
version	O
with	O
special	O
paintwork	O
and	O
a	O
rigid	O
version	O
of	O
the	O
Heliar	B-Algorithm
50mm	O
lens	O
sold	O
earlier	O
with	O
the	O
Bessa-T	O
.	O
</s>
<s>
They	O
were	O
updated	O
versions	O
of	O
the	O
Bessa	O
R2	O
,	O
with	O
the	O
Leica	B-Algorithm
M-mount	I-Algorithm
and	O
an	O
aperture-priority	O
automatic	O
exposure	O
,	O
switchable	O
to	O
manual	O
.	O
</s>
<s>
A	O
special	O
250th	O
Anniversary	O
Set	O
,	O
sold	O
with	O
a	O
50mm	O
M-mount	O
collapsible	O
Heliar	B-Algorithm
lens	O
,	O
was	O
also	O
announced	O
.	O
</s>
<s>
Announced	O
in	O
October	O
,	O
2006	O
at	O
photokina	O
,	O
the	O
Bessa	O
R4M	O
and	O
Bessa	O
R4A	O
were	O
the	O
first	O
Leica	B-Algorithm
M-mount	I-Algorithm
cameras	O
to	O
include	O
framelines	O
wider	O
than	O
28mm	O
.	O
</s>
