<s>
The	O
Olympus	O
Zuiko	O
Digital	O
ED	O
50-200mm	O
F2.8-3.5	O
is	O
an	O
interchangeable	O
lens	O
for	O
Four	B-Architecture
Thirds	I-Architecture
system	I-Architecture
digital	B-Device
single-lens	I-Device
reflex	I-Device
cameras	I-Device
announced	O
by	O
Olympus	O
Corporation	O
during	O
the	O
system	O
launch	O
on	O
June	O
24	O
,	O
2003	O
.	O
</s>
<s>
The	O
SWD	B-Algorithm
version	I-Algorithm
is	O
equipped	O
with	O
an	O
ultrasonic	O
motor	O
for	O
focusing	O
,	O
and	O
was	O
introduced	O
in	O
2007	O
with	O
the	O
Olympus	O
E-3	O
.	O
</s>
