<s>
Rectaflex	B-Algorithm
was	O
the	O
world	O
's	O
first	O
series	O
produced	O
Pentaprism	O
single	B-Algorithm
lens	I-Algorithm
reflex	I-Algorithm
camera	I-Algorithm
.	O
</s>
<s>
Rectaflex	B-Algorithm
was	O
the	O
only	O
Italian	O
single-lens	B-Algorithm
reflex	I-Algorithm
camera	I-Algorithm
ever	O
built	O
.	O
</s>
<s>
There	O
has	O
been	O
some	O
uncertainty	O
about	O
the	O
Rectaflex	B-Algorithm
being	O
first	O
or	O
second	O
pentaprism	O
SLR	B-Algorithm
to	O
be	O
produced	O
.	O
</s>
<s>
Marco	O
Antonettos	O
very	O
thorough	O
research	O
in	O
2002	O
clarified	O
that	O
the	O
Rectaflex	B-Algorithm
was	O
the	O
first	O
.	O
</s>
<s>
The	O
Rectaflex	B-Algorithm
was	O
a	O
35mm	O
SLR	B-Algorithm
camera	I-Algorithm
with	O
a	O
Focal-plane	O
shutter	O
,	O
interchangeable	O
lenses	O
and	O
a	O
pentaprism	O
eye-level	O
finder	O
.	O
</s>
<s>
It	O
was	O
the	O
world	O
's	O
first	O
SLR	B-Algorithm
equipped	O
with	O
a	O
pentaprism	O
,	O
with	O
a	O
final	O
presentation	O
in	O
April	O
1948	O
,	O
and	O
start	O
of	O
series	O
production	O
in	O
September	O
the	O
same	O
year	O
,	O
thus	O
hitting	O
the	O
market	O
one	O
year	O
before	O
the	O
Contax	O
S	O
,	O
presented	O
in	O
1949	O
.	O
</s>
<s>
The	O
first	O
prototype	O
of	O
the	O
Rectaflex	B-Algorithm
,	O
presented	O
at	O
the	O
Milano	O
Fiera	O
in	O
April	O
1947	O
,	O
was	O
a	O
wooden	O
mock-up	O
,	O
with	O
a	O
mirror	O
eye-level	O
finder	O
,	O
giving	O
a	O
left	O
to	O
right	O
inverted	O
image	O
.	O
</s>
<s>
This	O
was	O
corrected	O
with	O
a	O
roof	O
prism	O
before	O
the	O
1948	O
Milano	O
show	O
,	O
and	O
the	O
preseries	O
model	O
was	O
called	O
Rectaflex	B-Algorithm
Standard	O
947	O
,	O
and	O
had	O
a	O
fully	O
working	O
pentaprism	O
as	O
well	O
as	O
a	O
focal	O
plane	O
shutter	O
from	O
1s	O
to	O
1/1000	O
,	O
synchronised	O
at	O
1/25	O
.	O
</s>
<s>
The	O
first	O
production	O
model	O
was	O
the	O
Rectaflex	B-Algorithm
series	O
A	O
1000	O
(	O
serial	O
number	O
1000	O
to	O
2150	O
)	O
,	O
quite	O
similar	O
to	O
the	O
preseries	O
model	O
.	O
</s>
<s>
The	O
Rectaflex	B-Algorithm
series	O
B	O
2000	O
(	O
s/n	O
some	O
2150	O
to	O
2999	O
)	O
added	O
a	O
split	O
image	O
device	O
in	O
the	O
focusing	O
screen	O
and	O
had	O
no	O
film	O
cutter	O
.	O
</s>
<s>
Note	O
that	O
Rectaflex	B-Algorithm
series	O
A	O
1000	O
and	O
Rectaflex	B-Algorithm
series	O
B	O
2000	O
were	O
not	O
official	O
designations	O
,	O
but	O
a	O
way	O
to	O
recognize	O
the	O
variants	O
by	O
way	O
of	O
their	O
serial	O
number	O
.	O
</s>
<s>
The	O
Rectaflex	B-Algorithm
series	O
B	O
4000	O
(	O
s/n	O
4001	O
to	O
some	O
4500	O
)	O
had	O
a	O
modified	O
A/R	O
lever	O
.	O
</s>
<s>
The	O
Rectaflex	B-Algorithm
series	O
B	O
16000	O
(	O
s/n	O
16001	O
to	O
16870	O
)	O
had	O
a	O
triple	O
sync	O
plug	O
and	O
a	O
film	O
reminder	O
under	O
the	O
rewind	O
knob	O
.	O
</s>
<s>
The	O
Rectaflex	B-Algorithm
series	O
B	O
20000	O
(	O
s/n	O
20101	O
to	O
20300	O
)	O
had	O
an	O
internally	O
modified	O
shutter	O
and	O
a	O
reinforced	O
bayonet	O
mount	O
.	O
</s>
<s>
The	O
Rectaflex	B-Algorithm
series	O
25000	O
(	O
s/n	O
25000	O
to	O
29500	O
)	O
was	O
produced	O
from	O
December	O
1952	O
and	O
had	O
a	O
modified	O
shutter	O
to	O
1/1300	O
,	O
and	O
two	O
sync	O
plugs	O
only	O
.	O
</s>
<s>
These	O
two	O
last	O
series	O
are	O
sometimes	O
called	O
Rectaflex	B-Algorithm
1300	O
,	O
because	O
of	O
its	O
shutter	O
speed	O
,	O
the	O
previous	O
series	O
being	O
called	O
Rectaflex	B-Algorithm
1000	O
.	O
</s>
<s>
The	O
Rectaflex	B-Algorithm
Junior	O
was	O
a	O
Rectaflex	B-Algorithm
series	O
1000	O
transformed	O
with	O
a	O
simplified	O
focal	O
plane	O
shutter	O
from	O
1/25	O
to	O
1/500	O
.	O
</s>
<s>
The	O
Rectaflex	B-Algorithm
series	O
1000	O
had	O
reliability	O
trouble	O
,	O
so	O
an	O
important	O
number	O
(	O
between	O
500	O
and	O
1000	O
)	O
were	O
converted	O
.	O
</s>
<s>
The	O
Rectaflex	B-Algorithm
Gold	O
was	O
a	O
Rectaflex	B-Algorithm
series	O
25000	O
with	O
gold-plated	O
finish	O
and	O
lizard	O
body	O
covering	O
.	O
</s>
<s>
The	O
Rectaflex	B-Algorithm
Rotor	O
was	O
a	O
Rectaflex	B-Algorithm
series	O
25000	O
with	O
a	O
three-lens	O
turret	O
.	O
</s>
<s>
In	O
addition	O
,	O
some	O
Rectaflex	B-Algorithm
from	O
various	O
series	O
were	O
independently	O
converted	O
to	O
the	O
Rectaflex	B-Algorithm
Rotor	O
specifications	O
.	O
</s>
<s>
A	O
special	O
version	O
of	O
the	O
Rectaflex	B-Algorithm
series	O
25000	O
existed	O
with	O
24x32	O
format	O
and	O
a	O
microscope	O
adapter	O
,	O
for	O
scientific	O
use	O
.	O
</s>
<s>
After	O
the	O
Rectaflex	B-Algorithm
30000	O
the	O
original	O
Rectaflex	B-Algorithm
company	O
went	O
down	O
,	O
and	O
a	O
new	O
Rectaflex	B-Algorithm
company	O
was	O
formed	O
,	O
partly	O
controlled	O
by	O
the	O
Prince	O
of	O
Liechtenstein	O
.	O
</s>
<s>
In	O
1956	O
they	O
launched	O
a	O
Rectaflex	B-Algorithm
40000	O
,	O
often	O
called	O
Rectaflex	B-Algorithm
Liechtenstein	O
.	O
</s>
<s>
The	O
Recta	O
was	O
a	O
prototype	O
rangefinder	O
camera	O
based	O
on	O
the	O
Rectaflex	B-Algorithm
.	O
</s>
<s>
The	O
Recta	O
was	O
designed	O
by	O
Telemaco	O
Corsi	O
in	O
1953	O
,	O
before	O
the	O
demise	O
of	O
Rectaflex	B-Algorithm
.	O
</s>
<s>
The	O
Rectamatic	O
was	O
the	O
project	O
of	O
an	O
advanced	O
35mm	O
SLR	B-Algorithm
camera	I-Algorithm
,	O
designed	O
by	O
Telemaco	O
Corsi	O
at	O
the	O
beginning	O
of	O
the	O
1960s	O
,	O
as	O
a	O
successor	O
of	O
the	O
Rectaflex	B-Algorithm
.	O
</s>
