<s>
A	O
folding	B-Algorithm
camera	I-Algorithm
is	O
a	O
camera	O
type	O
.	O
</s>
<s>
Folding	B-Algorithm
cameras	I-Algorithm
fold	O
into	O
a	O
compact	O
and	O
rugged	O
package	O
for	O
storage	O
.	O
</s>
<s>
The	O
lens	O
and	O
shutter	O
are	O
attached	O
to	O
a	O
lens-board	O
which	O
is	O
connected	O
to	O
the	O
body	O
of	O
the	O
camera	O
by	O
a	O
light-tight	O
folding	O
bellows	B-Algorithm
.	O
</s>
<s>
The	O
key	O
advantage	O
of	O
folding	B-Algorithm
cameras	I-Algorithm
is	O
their	O
excellent	O
physical-size	O
to	O
film-size	O
ratio	O
when	O
the	O
camera	O
is	O
folded	O
for	O
storage	O
.	O
</s>
<s>
Portable	O
folding	B-Algorithm
cameras	I-Algorithm
dominated	O
camera	O
design	O
from	O
the	O
1890s	O
to	O
1930s	O
and	O
were	O
significant	O
into	O
the	O
late	O
1940s	O
.	O
</s>
<s>
Specialized	O
cameras	O
such	O
as	O
the	O
Polaroid	B-Algorithm
SX-70	I-Algorithm
Instant	O
film	O
camera	O
,	O
and	O
the	O
Speed	B-Algorithm
Graphic	I-Algorithm
press	O
cameras	O
used	O
folding	O
designs	O
into	O
the	O
1970s	O
.	O
</s>
<s>
The	O
use	O
of	O
folding	B-Algorithm
cameras	I-Algorithm
declined	O
in	O
the	O
late	O
1930s	O
with	O
advances	O
in	O
lens	O
technology	O
allowing	O
superior	O
enlargement	O
,	O
high	O
quality	O
images	O
on	O
smaller	O
negatives	O
,	O
and	O
shorter	O
distances	O
between	O
the	O
lens	O
and	O
the	O
film	O
.	O
</s>
<s>
35mm	O
film	O
made	O
small-sized	O
cameras	O
practical	O
without	O
using	O
bellows	B-Algorithm
.	O
</s>
<s>
However	O
,	O
some	O
35mm	O
cameras	O
continued	O
to	O
be	O
built	O
as	O
folding	B-Algorithm
cameras	I-Algorithm
,	O
e.g.	O
,	O
the	O
original	O
Kodak	B-Algorithm
Retina	I-Algorithm
and	O
the	O
Ensign	O
Midget	O
model	O
22	O
camera	O
(	O
image	O
at	O
lower	O
right	O
)	O
.	O
</s>
