<s>
The	O
Canon	B-Algorithm
Pellix	I-Algorithm
is	O
a	O
manual-focus	O
single-lens	B-Algorithm
reflex	I-Algorithm
(	O
SLR	B-Algorithm
)	O
camera	O
released	O
in	O
1965	O
that	O
uses	O
a	O
stationary	O
half-silvered	O
mirror	O
behind	O
which	O
a	O
metering	O
cell	O
is	O
raised	O
during	O
light	O
level	O
metering	O
.	O
</s>
<s>
Canon	O
suddenly	O
switched	O
from	O
professionally	O
oriented	O
SLR	B-Algorithm
cameras	I-Algorithm
to	O
advanced	O
amateur	O
cameras	O
in	O
March	O
1964	O
,	O
when	O
they	O
left	O
the	O
Canon	B-Algorithm
Canonflex	I-Algorithm
range	O
and	O
launched	O
the	O
Canon	B-Algorithm
FX	I-Algorithm
with	O
the	O
FL	B-Algorithm
lens	I-Algorithm
mount	I-Algorithm
.	O
</s>
<s>
The	O
Canon	B-Algorithm
FP	I-Algorithm
without	O
exposure	O
meter	O
was	O
added	O
later	O
the	O
same	O
year	O
.	O
</s>
<s>
Then	O
,	O
just	O
half	O
a	O
year	O
later	O
in	O
the	O
spring	O
of	O
1965	O
,	O
Canon	O
surprised	O
the	O
camera	O
community	O
with	O
the	O
remarkable	O
Pellix	B-Algorithm
.	O
</s>
<s>
However	O
,	O
what	O
makes	O
the	O
Pellix	B-Algorithm
special	O
,	O
is	O
that	O
the	O
TTL	O
metering	O
is	O
accomplished	O
using	O
a	O
stationary	O
semitransparent	O
pellicle	B-Algorithm
reflex	I-Algorithm
mirror	I-Algorithm
instead	O
of	O
the	O
usual	O
moving	O
SLR	B-Algorithm
mirror	O
,	O
and	O
placing	O
a	O
CdS	O
meter	O
cell	O
behind	O
it	O
for	O
the	O
TTL	O
exposure	O
measurement	O
.	O
</s>
<s>
As	O
with	O
the	O
Canon	B-Algorithm
FX	I-Algorithm
and	O
FP	O
,	O
the	O
camera	O
back	O
is	O
opened	O
turning	O
a	O
key	O
at	O
the	O
base	O
.	O
</s>
<s>
The	O
Pellix	B-Algorithm
was	O
replaced	O
by	O
the	O
improved	O
Canon	B-Algorithm
Pellix	I-Algorithm
QL	I-Algorithm
first	O
marketed	O
in	O
March	O
1966	O
.	O
</s>
<s>
The	O
semitransparent	O
fixed	O
mirror	O
in	O
the	O
Pellix	B-Algorithm
,	O
for	O
the	O
first	O
time	O
successfully	O
used	O
in	O
a	O
35mm	O
SLR	B-Algorithm
camera	I-Algorithm
,	O
lets	O
about	O
two-thirds	O
(	O
66%	O
)	O
of	O
the	O
light	O
from	O
the	O
lens	O
pass	O
directly	O
through	O
to	O
the	O
film	O
,	O
while	O
the	O
rest	O
is	O
reflected	O
to	O
the	O
viewfinder	O
.	O
</s>
<s>
A	O
more	O
serious	O
problem	O
is	O
that	O
the	O
image-forming	O
light	O
rays	O
must	O
pass	O
through	O
the	O
stationary	O
pellicle	B-Algorithm
mirror	I-Algorithm
,	O
which	O
over	O
time	O
accumulates	O
dirt	O
,	O
scattering	O
light	O
and	O
degrading	O
the	O
image	O
.	O
</s>
<s>
The	O
operating	O
noise	O
from	O
the	O
Pellix	B-Algorithm
is	O
surprisingly	O
similar	O
to	O
that	O
of	O
the	O
Canon	B-Algorithm
FX	I-Algorithm
,	O
despite	O
not	O
having	O
a	O
moving	O
reflex	O
mirror	O
.	O
</s>
<s>
The	O
Meter	O
circuit	O
is	O
susceptible	O
to	O
breakage	O
due	O
to	O
the	O
CdS	O
meter	O
arm	O
being	O
moved	O
into	O
position	O
behind	O
the	O
pellicle	B-Algorithm
mirror	I-Algorithm
during	O
exposure	O
reading	O
.	O
</s>
<s>
A	O
special	O
lens	O
was	O
made	O
available	O
for	O
the	O
Canon	B-Algorithm
Pellix	I-Algorithm
,	O
the	O
FLP	O
38mm	O
1:2.8	O
,	O
utilising	O
the	O
fact	O
the	O
camera	O
has	O
a	O
stationary	O
mirror	O
that	O
will	O
not	O
hit	O
the	O
lens	O
 '	O
rear	O
element	O
.	O
</s>
<s>
The	O
FLP	O
code	O
indicates	O
that	O
this	O
lens	O
is	O
exclusively	O
to	O
be	O
used	O
on	O
Pellix	B-Algorithm
camera	O
.	O
</s>
