<s>
The	O
Kine	B-Algorithm
Exakta	I-Algorithm
was	O
the	O
first	O
35mm	O
single-lens	B-Algorithm
reflex	I-Algorithm
(	O
SLR	B-Algorithm
)	O
still	O
camera	O
in	O
regular	O
production	O
.	O
</s>
<s>
The	O
Exakta	O
name	O
had	O
already	O
been	O
used	O
by	O
Ihagee	O
on	O
a	O
roll	O
film	O
rangefinder	O
RF	O
camera	O
line	O
since	O
1933	O
,	O
among	O
these	O
the	O
Vest	O
Pocket	O
Exakta	O
Model	O
B	O
from	O
which	O
the	O
Kine	B-Algorithm
Exakta	I-Algorithm
inherited	O
its	O
general	O
layout	O
and	O
appearance	O
.	O
</s>
<s>
Several	O
of	O
its	O
features	O
constituted	O
the	O
foundation	O
for	O
the	O
majority	O
of	O
35mm	O
SLR	B-Algorithm
cameras	I-Algorithm
produced	O
ever	O
since	O
,	O
although	O
at	O
this	O
stage	O
in	O
a	O
relatively	O
primitive	O
state	O
.	O
</s>
<s>
The	O
single	B-Algorithm
lens	I-Algorithm
reflex	I-Algorithm
principle	I-Algorithm
is	O
even	O
older	O
and	O
was	O
widely	O
used	O
in	O
cameras	O
for	O
the	O
medium	O
format	O
plate	O
-	O
and	O
film	O
material	O
.	O
</s>
<s>
However	O
,	O
several	O
obstacles	O
had	O
to	O
be	O
overcome	O
to	O
devise	O
a	O
useful	O
miniature	O
SLR	B-Algorithm
camera	I-Algorithm
apart	O
from	O
the	O
fact	O
that	O
the	O
film	O
material	O
itself	O
seriously	O
restricted	O
the	O
usefulness	O
of	O
the	O
negative	O
:	O
It	O
is	O
impossible	O
to	O
determine	O
sharp	O
focus	O
on	O
a	O
ground	O
glass	O
for	O
this	O
format	O
with	O
the	O
naked	O
eye	O
-	O
even	O
with	O
a	O
large	O
aperture	O
lens	O
.	O
</s>
<s>
Also	O
to	O
improve	O
focusing	O
accuracy	O
fast	O
lenses	O
were	O
needed	O
,	O
and	O
from	O
the	O
start	O
Carl	O
Zeiss	O
Jena	O
provided	O
the	O
Tessar	O
1:2.8	O
f	O
=	O
5cm	O
,	O
soon	O
to	O
be	O
followed	O
by	O
the	O
Biotar	O
1:2	O
5cm	O
and	O
the	O
Schneider-Kreuznach	O
Xenar	O
1:2	O
f	O
=	O
5cm	O
for	O
the	O
Kine	B-Algorithm
Exakta	I-Algorithm
.	O
</s>
<s>
The	O
Kine	B-Algorithm
Exakta	I-Algorithm
is	O
made	O
of	O
two	O
major	O
aluminium	O
alloy	O
castings	O
,	O
the	O
outer	O
body	O
shell	O
and	O
the	O
internal	O
frame	O
for	O
the	O
mirror	O
box	O
,	O
the	O
shutter	O
mechanism	O
and	O
the	O
film	O
transport	O
.	O
</s>
<s>
The	O
Exakta	O
bayonet	O
lens	B-Algorithm
mount	I-Algorithm
was	O
developed	O
for	O
this	O
camera	O
.	O
</s>
<s>
The	O
Kine	B-Algorithm
Exakta	I-Algorithm
controls	O
are	O
somewhat	O
different	O
from	O
those	O
found	O
on	O
most	O
later	O
35mm	O
SLR	B-Algorithm
film	O
cameras	O
:	O
the	O
finder	O
hood	O
in	O
its	O
collapsed	O
state	O
automatically	O
blocks	O
the	O
shutter	O
release	O
.	O
</s>
<s>
Only	O
a	O
few	O
significant	O
changes	O
were	O
made	O
to	O
the	O
original	O
Kine	B-Algorithm
Exakta	I-Algorithm
(	O
version	O
1	O
)	O
during	O
its	O
production	O
run	O
until	O
it	O
was	O
replaced	O
by	O
the	O
model	O
II	O
in	O
1948	O
:	O
Within	O
a	O
few	O
months	O
the	O
circular	O
focusing	O
loupe	O
,	O
visible	O
on	O
top	O
of	O
the	O
collapsed	O
finder	O
hood	O
,	O
was	O
replaced	O
by	O
a	O
rectangular	O
one	O
covering	O
about	O
50%	O
of	O
the	O
ground	O
glass	O
image	O
(	O
version	O
2	O
)	O
.	O
</s>
