<s>
The	O
Canon	B-Algorithm
EOS	I-Algorithm
RT	I-Algorithm
is	O
a	O
35mm	O
single-lens	B-Algorithm
reflex	I-Algorithm
camera	I-Algorithm
produced	O
by	O
Canon	O
and	O
sold	O
from	O
1989	O
to	O
1992	O
.	O
</s>
<s>
The	O
camera	O
is	O
essentially	O
an	O
EOS	O
630/EOS	O
600	O
with	O
a	O
pellicle	B-Algorithm
mirror	I-Algorithm
.	O
</s>
<s>
Only	O
25,000	O
were	O
manufactured	O
at	O
the	O
end	O
of	O
the	O
EOS	B-Algorithm
630	I-Algorithm
production	O
run	O
,	O
so	O
the	O
EOS	B-Algorithm
RT	I-Algorithm
was	O
technically	O
"	O
out	O
of	O
production	O
"	O
before	O
it	O
ever	O
went	O
on	O
sale	O
.	O
</s>
<s>
The	O
EOS	B-Algorithm
RT	I-Algorithm
was	O
the	O
first	O
autofocus	O
camera	O
to	O
feature	O
a	O
pellicle	B-Algorithm
mirror	I-Algorithm
,	O
followed	O
by	O
the	O
EOS	B-Algorithm
1N	I-Algorithm
RS	I-Algorithm
five	O
years	O
later	O
.	O
</s>
<s>
Canon	O
had	O
made	O
a	O
few	O
manual	O
focus	O
pellicle	B-Algorithm
mirror	I-Algorithm
SLR	B-Algorithm
bodies	O
previously	O
,	O
including	O
the	O
Pellix	B-Algorithm
,	O
Pellix	B-Algorithm
QL	I-Algorithm
,	O
and	O
special	O
limited-production	O
cameras	O
made	O
for	O
professional	O
photographers	O
at	O
the	O
1972	O
and	O
1984	O
Olympic	O
Games	O
(	O
the	O
F-1	B-Algorithm
and	O
New	B-Algorithm
F-1	I-Algorithm
High	O
Speed	O
Motor	B-Algorithm
Drive	I-Algorithm
models	O
respectively	O
)	O
.	O
</s>
<s>
Pellicle	B-Algorithm
mirrors	I-Algorithm
offer	O
some	O
of	O
the	O
advantages	O
of	O
a	O
rangefinder	B-Algorithm
camera	I-Algorithm
in	O
an	O
SLR	B-Algorithm
.	O
</s>
<s>
When	O
taking	O
a	O
picture	O
with	O
a	O
typical	O
SLR	B-Algorithm
camera	I-Algorithm
,	O
the	O
mirror	O
must	O
flip	O
upwards	O
to	O
move	O
out	O
of	O
the	O
way	O
to	O
allow	O
light	O
to	O
pass	O
from	O
the	O
lens	O
to	O
the	O
film	O
plane	O
(	O
or	O
digital	B-Algorithm
image	I-Algorithm
sensor	I-Algorithm
)	O
.	O
</s>
<s>
Quiet	O
operation	O
,	O
low	O
vibration	O
,	O
absence	O
of	O
blackout	O
,	O
and	O
fast	O
response	O
are	O
features	O
usually	O
associated	O
with	O
rangefinder	B-Algorithm
cameras	I-Algorithm
,	O
as	O
these	O
cameras	O
have	O
no	O
mirror	O
reflex	O
system	O
between	O
the	O
lens	O
and	O
the	O
film	O
.	O
</s>
<s>
In	O
its	O
normal	O
operating	O
mode	O
,	O
the	O
lag	O
time	O
between	O
the	O
shutter	O
button	O
press	O
and	O
the	O
shutter	O
release	O
on	O
the	O
EOS	B-Algorithm
RT	I-Algorithm
is	O
8	O
microsecond	O
:	O
note	O
that	O
the	O
camera	O
can	O
be	O
set	O
to	O
a	O
more	O
conventional	O
shutter	O
release	O
delay	O
of	O
40	O
microseconds	O
,	O
same	O
as	O
Canon	O
's	O
flagship	O
FD-mount	O
camera	O
,	O
the	O
F-1	B-Algorithm
.	O
</s>
<s>
Canon	O
however	O
,	O
somewhat	O
undid	O
the	O
attractiveness	O
of	O
the	O
camera	O
by	O
using	O
the	O
shutter	O
from	O
the	O
EOS	O
630/EOS	O
600	O
which	O
had	O
a	O
flash	O
synchronization	O
speed	O
of	O
1/125	O
second	O
,	O
instead	O
of	O
the	O
higher	O
speed	O
1/250	O
second	O
speed	O
of	O
the	O
shutter	O
used	O
on	O
the	O
EOS	B-Algorithm
620	I-Algorithm
,	O
the	O
other	O
professional	O
EOS	O
camera	O
at	O
this	O
time	O
.	O
</s>
<s>
A	O
pellicle	B-Algorithm
mirror	I-Algorithm
,	O
such	O
as	O
the	O
one	O
in	O
the	O
EOS	B-Algorithm
RT	I-Algorithm
,	O
always	O
reflects	O
some	O
of	O
the	O
light	O
up	O
to	O
the	O
viewfinder	O
,	O
and	O
allows	O
the	O
rest	O
to	O
pass	O
to	O
the	O
film	O
plane	O
.	O
</s>
<s>
A	O
disadvantage	O
of	O
a	O
pellicle	B-Algorithm
mirror	I-Algorithm
is	O
that	O
the	O
light	O
diverted	O
to	O
the	O
viewfinder	O
means	O
less	O
light	O
is	O
available	O
to	O
expose	O
the	O
film	O
—	O
in	O
the	O
case	O
of	O
the	O
EOS	B-Algorithm
RT	I-Algorithm
,	O
the	O
lens	O
effectively	O
loses	O
2/3	O
of	O
a	O
t-stop	O
.	O
</s>
<s>
Cameras	O
such	O
as	O
the	O
Canon	B-Algorithm
EOS-1D	I-Algorithm
and	O
Canon	B-Device
EOS-1D	I-Device
Mark	I-Device
II	I-Device
are	O
able	O
to	O
take	O
8+	O
frames	O
per	O
second	O
while	O
moving	O
the	O
mirror	O
back	O
and	O
forth	O
,	O
which	O
is	O
very	O
close	O
to	O
the	O
10	O
frame	O
per	O
second	O
rate	O
of	O
the	O
pellicle	O
mirror-equipped	O
1N	O
RS	O
.	O
</s>
<s>
The	O
EOS-1v	B-Algorithm
with	O
PB-E2	O
power	O
booster	O
(	O
2000	O
release	O
)	O
and	O
the	O
EOS-1D	B-Algorithm
Mark	I-Algorithm
III	I-Algorithm
are	O
capable	O
of	O
sustaining	O
10	O
frames	O
per	O
second	O
burst	O
rates	O
without	O
the	O
use	O
of	O
a	O
pellicle	B-Algorithm
mirror	I-Algorithm
.	O
</s>
<s>
Finally	O
,	O
the	O
pellicle	B-Algorithm
mirror	I-Algorithm
also	O
degrades	O
lens	O
resolution	O
.	O
</s>
<s>
Early	O
tests	O
performed	O
by	O
Modern	O
Photography	O
magazine	O
showed	O
that	O
Canon	O
film	O
cameras	O
with	O
conventional	O
mirrors	O
produce	O
sharper	O
images	O
than	O
Canon	O
cameras	O
with	O
a	O
pellicle	B-Algorithm
mirror	I-Algorithm
.	O
</s>
<s>
Nevertheless	O
,	O
Sony	O
has	O
implemented	O
a	O
very	O
similar	O
technology	O
on	O
its	O
current	O
digital	O
interchangeable-lens	O
DSLR-like	O
camera	O
line	O
,	O
called	O
SLT	B-Device
cameras	I-Device
.	O
</s>
