<s>
The	O
Rollei	O
35	O
series	O
remains	O
one	O
of	O
the	O
smallest	O
35mm	O
cameras	O
after	O
the	O
Minolta	B-Algorithm
TC-1	I-Algorithm
and	O
Minox	O
35	O
.	O
</s>
<s>
In	O
about	O
1960	O
,	O
when	O
the	O
first	O
subminiature	B-Algorithm
cameras	I-Algorithm
for	O
16	O
mm	O
film	O
came	O
to	O
market	O
,	O
Heinz	O
Waaske	O
,	O
chief	O
engineer	O
of	O
German	O
camera	O
maker	O
Wirgin	O
,	O
proposed	O
that	O
the	O
purchasers	O
of	O
the	O
16mm	O
subminiature	B-Algorithm
cameras	I-Algorithm
,	O
or	O
even	O
the	O
half-frame	O
Olympus	B-Algorithm
Pen	I-Algorithm
35mm	O
cameras	O
,	O
were	O
motivated	O
not	O
by	O
the	O
tiny	O
film	O
format	O
but	O
the	O
size	O
of	O
the	O
cameras	O
.	O
</s>
<s>
After	O
having	O
already	O
engineered	O
and	O
designed	O
the	O
16mm	O
Wirgin	B-Algorithm
Edixa	I-Algorithm
16	I-Algorithm
as	O
well	O
as	O
35mm	O
single-lens-reflex	O
cameras	O
,	O
he	O
now	O
set	O
out	O
to	O
build	O
a	O
35mm	O
camera	O
in	O
a	O
housing	O
only	O
one	O
third	O
of	O
the	O
volume	O
of	O
the	O
viewfinder	O
cameras	O
of	O
the	O
time	O
.	O
</s>
<s>
For	O
the	O
shutter-coupled	O
exposure	O
meter	O
of	O
the	O
prototype	O
camera	O
,	O
Waaske	O
selected	O
a	O
selenium	B-Library
cell	O
powered	O
meter	O
from	O
.	O
</s>
<s>
Waaske	O
's	O
little	O
camera	O
was	O
presented	O
at	O
photokina	O
in	O
1966	O
as	O
Rollei	O
35	O
,	O
with	O
a	O
better	O
lens	O
–	O
the	O
Zeiss	O
Tessar	O
3.5/40mm	O
lens	O
,	O
a	O
state-of-the-art	O
CdS-exposure	O
meter	O
and	O
a	O
precision-made	O
diaphragm	O
shutter	O
made	O
by	O
Compur	O
,	O
using	O
Waaske	O
's	O
patented	O
shutter	O
design	O
.	O
</s>
<s>
Whether	O
to	O
use	O
either	O
a	O
photovoltaic	O
selenium	B-Library
sensor	O
or	O
a	O
CdS	B-Device
photoresistor	O
,	O
was	O
finally	O
decided	O
in	O
August	O
in	O
favour	O
of	O
the	O
CdS	B-Device
.	O
</s>
<s>
A	O
selenium-cell	O
powered	O
light	O
meter	O
was	O
cheaper	O
in	O
production	O
and	O
did	O
not	O
need	O
a	O
battery	O
.	O
</s>
<s>
However	O
,	O
the	O
much	O
smaller	O
CdS-photoresistor	O
improved	O
the	O
stylish	O
look	O
of	O
the	O
camera	O
,	O
the	O
battery	O
powered	O
light-meter	O
was	O
more	O
shock-resistant	O
,	O
and	O
the	O
"	O
CdS	B-Device
technology	O
"	O
could	O
be	O
used	O
as	O
a	O
selling	O
point	O
in	O
advertising	O
.	O
</s>
<s>
The	O
housing	O
needed	O
to	O
be	O
changed	O
just	O
slightly	O
,	O
since	O
Waaske	O
unknowingly	O
had	O
adopted	O
the	O
appearance	O
of	O
Rollei	O
's	O
twin-lens	B-Algorithm
reflex	I-Algorithm
cameras	I-Algorithm
,	O
by	O
placing	O
the	O
exposure	O
time	O
and	O
aperture	B-General_Concept
controls	O
to	O
the	O
right	O
and	O
to	O
the	O
left	O
side	O
of	O
the	O
lens	O
.	O
</s>
<s>
For	O
the	O
mercury	B-Algorithm
battery	I-Algorithm
PX	O
13	O
(=	O
PX	O
625	O
=	O
MR	O
9	O
)	O
of	O
the	O
light	O
meter	O
,	O
a	O
place	O
was	O
found	O
inside	O
the	O
camera	O
housing	O
.	O
</s>
<s>
The	O
film	O
rewind	O
knob	O
of	O
the	O
engineering	O
model	O
was	O
exchanged	O
for	O
a	O
rewind	O
crank	O
,	O
and	O
a	O
hot	B-Algorithm
shoe	I-Algorithm
was	O
added	O
for	O
mounting	O
an	O
electronic	O
flash	O
at	O
the	O
base	O
plate	O
.	O
</s>
<s>
Mounting	O
the	O
hot	B-Algorithm
shoe	I-Algorithm
at	O
the	O
frame	O
cover	O
would	O
likely	O
cause	O
damage	O
when	O
using	O
one	O
of	O
the	O
heavy	O
flash	O
lights	O
of	O
that	O
time	O
.	O
</s>
<s>
The	O
projected	O
name	O
for	O
the	O
camera	O
was	O
at	O
first	O
to	O
be	O
the	O
Rollei	B-Algorithm
Privat	I-Algorithm
,	O
which	O
even	O
was	O
the	O
engraving	O
on	O
the	O
final	O
draft	O
in	O
March	O
1966	O
.	O
</s>
<s>
The	O
voltage	O
of	O
the	O
mercury	B-Algorithm
battery	I-Algorithm
dropped	O
so	O
rapidly	O
at	O
the	O
end	O
of	O
the	O
battery	O
's	O
life	O
that	O
it	O
would	O
be	O
hard	O
to	O
obtain	O
a	O
wrong	O
exposure	O
.	O
</s>
<s>
The	O
second	O
concept	O
study	O
retained	O
the	O
sliding	O
tube	O
for	O
the	O
lens	O
,	O
but	O
used	O
a	O
selenium	B-Library
light	O
meter	O
.	O
</s>
<s>
A	O
light	O
meter	O
for	O
the	O
accessory	B-Algorithm
shoe	I-Algorithm
was	O
assigned	O
to	O
be	O
built	O
by	O
Gossen	O
in	O
early	O
1968	O
,	O
but	O
finally	O
an	O
uncoupled	O
light	O
meter	O
was	O
integrated	O
in	O
the	O
camera	O
housing	O
.	O
</s>
<s>
The	O
control	O
wheels	O
on	O
the	O
camera	O
body	O
were	O
replaced	O
by	O
a	O
more	O
conventional	O
aperture	B-General_Concept
control	O
at	O
the	O
lens	O
tube	O
,	O
and	O
the	O
control	O
wheel	O
for	O
exposure	O
time	O
was	O
placed	O
at	O
the	O
sliding	O
tube	O
base	O
on	O
the	O
body	O
.	O
</s>
<s>
Both	O
of	O
these	O
models	O
offered	O
a	O
shutter	O
timing	O
range	O
from	O
1/30	O
sec	O
to	O
1/500	O
sec	O
and	O
an	O
aperture	B-General_Concept
range	O
from	O
f/3.5	O
to	O
f/22	O
.	O
</s>
<s>
The	O
uncoupled	O
selenium	B-Library
light	O
meter	O
was	O
replaced	O
by	O
a	O
new	O
electronically	O
coupled	O
light	O
meter	O
,	O
using	O
variable	O
resistors	O
for	O
transferring	O
the	O
aperture	B-General_Concept
and	O
shutter	O
control	O
settings	O
to	O
the	O
light	O
meter	O
.	O
</s>
<s>
shutter	O
position	O
and	O
aperture	B-General_Concept
control	O
settings	O
were	O
transferred	O
,	O
without	O
any	O
electrical	O
contact	O
wear	O
and	O
tear	O
,	O
using	O
a	O
differential	O
gear	O
turning	O
a	O
variable	O
density	O
filter	O
in	O
front	O
of	O
the	O
CdS	B-Device
light	O
sensor	O
.	O
</s>
<s>
Without	O
adjusting	O
,	O
the	O
higher	O
voltage	O
of	O
1.55	O
volts	O
would	O
lead	O
to	O
overexposure	O
by	O
2	O
to	O
3	O
aperture	B-General_Concept
steps	O
.	O
</s>
<s>
Light	O
meter	O
using	O
selenium	B-Library
cell	O
,	O
no	O
battery	O
.	O
</s>
