<s>
The	O
Tessina	B-Algorithm
(	O
officially	O
created	O
by	O
Arnold	O
Siegrist	O
)	O
is	O
a	O
high-quality	O
35mm	O
camera	O
patented	O
by	O
Austrian	O
chemical	O
engineer	O
Dr.	O
Rudolph	O
Steineck	O
in	O
Lugano	O
Switzerland	O
,	O
manufactured	O
by	O
Siegrist	O
in	O
Grenchen	O
Switzerland	O
.	O
</s>
<s>
The	O
Tessina	B-Algorithm
takes	O
14x21mm	O
pictures	O
on	O
standard	O
35mm	O
film	O
(	O
loaded	O
into	O
a	O
special	O
cassette	O
)	O
,	O
making	O
it	O
one	O
of	O
the	O
few	O
subminiature	O
cameras	O
to	O
use	O
the	O
format	O
.	O
</s>
<s>
It	O
is	O
a	O
very	O
small	O
(	O
2.5x2x1inch	O
)	O
twin	B-Algorithm
lens	I-Algorithm
reflex	I-Algorithm
,	O
with	O
two	O
25mm	O
f/2.8	O
Tessinon	O
lenses	O
,	O
one	O
for	O
taking	O
the	O
picture	O
,	O
the	O
other	O
for	O
viewing	O
on	O
a	O
tiny	O
ground-glass	O
focusing	O
screen	O
on	O
top	O
of	O
the	O
camera	O
.	O
</s>
<s>
Apertures	B-General_Concept
are	O
continuously	O
variable	O
down	O
to	O
f/22	O
,	O
and	O
shutter	O
speeds	O
range	O
from	O
1/2	O
to	O
1/500	O
,	O
and	O
B	O
.	O
</s>
<s>
The	O
Tessina	B-Algorithm
35	O
,	O
Tessina	B-Algorithm
L	O
can	O
focus	O
down	O
to	O
9	O
inches	O
,	O
Tessina	B-Algorithm
Automatic	O
35mm	O
to	O
12	O
inches	O
.	O
</s>
<s>
The	O
film	O
is	O
advanced	O
via	O
a	O
clockwork	B-Application
master	O
spring	O
built	O
into	O
the	O
takeup	O
spool	O
,	O
with	O
a	O
pullout	O
winder	O
like	O
the	O
crown	O
on	O
a	O
wristwatch	O
.	O
</s>
<s>
Tessina	B-Algorithm
is	O
hand	O
assembled	O
from	O
more	O
than	O
two	O
hundred	O
precision	O
parts	O
,	O
it	O
contains	O
ruby	O
bearing	O
like	O
swiss	O
watch	O
to	O
reduce	O
friction	O
,	O
each	O
camera	O
is	O
designed	O
for	O
100,000	O
pictures	O
.	O
</s>
<s>
Three	O
models	O
have	O
been	O
produced	O
:	O
Tessina	B-Algorithm
Automatic	O
35mm	O
,	O
Tessina	B-Algorithm
35	O
and	O
Tessina	B-Algorithm
L	O
;	O
available	O
were	O
a	O
variety	O
of	O
color/finish	O
combinations	O
that	O
included	O
brushed	O
,	O
painted	O
or	O
anodized	O
aluminium	O
,	O
black	O
and	O
aluminium	O
,	O
all	O
black	O
,	O
gold	O
and	O
red	O
.	O
</s>
