<s>
The	O
original	O
R-D1	O
,	O
announced	O
by	O
Epson	O
in	O
March	O
2004	O
and	O
discontinued	O
in	O
2007	O
,	O
was	O
the	O
first	O
digital	O
rangefinder	B-Algorithm
camera	I-Algorithm
.	O
</s>
<s>
R-D1	O
was	O
jointly	O
developed	O
by	O
Seiko	O
Epson	O
and	O
Cosina	O
and	O
manufactured	O
by	O
the	O
latter	O
,	O
which	O
also	O
builds	O
the	O
current	O
Voigtländer	B-Algorithm
cameras	O
.	O
</s>
<s>
It	O
uses	O
Leica	B-Algorithm
M-mount	I-Algorithm
lenses	O
or	O
earlier	O
Leica	O
screw	O
mount	O
lenses	O
with	O
an	O
adapter	O
.	O
</s>
<s>
The	O
controls	O
operate	O
in	O
the	O
same	O
way	O
as	O
film-based	O
rangefinder	B-Algorithm
cameras	I-Algorithm
.	O
</s>
<s>
The	O
same	O
sensor	O
as	O
used	O
in	O
Pentax	B-Algorithm
*	I-Algorithm
ist	I-Algorithm
D	I-Algorithm
,	O
Nikon	B-Algorithm
D100	I-Algorithm
.	O
</s>
