<s>
The	O
Fuji	B-Algorithm
GX680	I-Algorithm
is	O
a	O
series	O
of	O
single	B-Algorithm
lens	I-Algorithm
reflex	I-Algorithm
system	B-Algorithm
cameras	I-Algorithm
for	O
medium	O
format	O
film	O
produced	O
by	O
Fujifilm	O
with	O
interchangeable	O
camera	O
lenses	O
and	O
interchangeable	O
film	O
holders	O
for	O
the	O
unusual	O
film	O
format	O
6×8cm	O
on	O
120	O
and	O
220	O
roll	O
film	O
.	O
</s>
<s>
The	O
distinguishing	O
feature	O
of	O
the	O
Fuji	B-Algorithm
GX680	I-Algorithm
is	O
the	O
articulating	O
front	O
standard	O
,	O
which	O
runs	O
on	O
a	O
rail	O
connecting	O
lens	O
and	O
camera	O
body	O
by	O
a	O
bellows	B-Algorithm
;	O
the	O
interchangeable	O
lens	O
is	O
permanently	O
mounted	O
to	O
a	O
lens	O
board	O
.	O
</s>
<s>
Mamiya	O
RB67	O
and	O
RZ67	B-Algorithm
and	O
Rolleiflex	B-Algorithm
SL66	I-Algorithm
,	O
for	O
some	O
models	O
of	O
the	O
Fuji	B-Algorithm
GX680	I-Algorithm
the	O
front	O
standard	O
can	O
be	O
shifted	O
right	O
,	O
left	O
,	O
up	O
and	O
down	O
for	O
perspective	O
control	O
,	O
and	O
the	O
front	O
standard	O
can	O
also	O
be	O
tilted	O
on	O
horizontal	O
and	O
vertical	O
axes	O
to	O
control	O
depth	O
of	O
field	O
using	O
the	O
Scheimpflug	O
principle	O
.	O
</s>
<s>
Therefore	O
,	O
the	O
Fuji	B-Algorithm
GX680	I-Algorithm
has	O
many	O
of	O
the	O
same	O
camera	O
movements	O
of	O
a	O
large	O
format	O
view	B-Algorithm
camera	I-Algorithm
,	O
only	O
limited	O
by	O
restricted	O
motions	O
of	O
the	O
front	O
standard	O
and	O
a	O
fixed	O
rear	O
standard	O
,	O
making	O
the	O
camera	O
also	O
suitable	O
for	O
architectural	O
photography	O
.	O
</s>
<s>
The	O
Fuji	B-Algorithm
GX680	I-Algorithm
has	O
quite	O
large	O
physical	O
dimensions	O
for	O
a	O
medium-format	O
camera	O
,	O
but	O
compared	O
to	O
the	O
typical	O
monorail/studio	O
large-format	O
camera	O
,	O
the	O
Fuji	B-Algorithm
GX680	I-Algorithm
is	O
more	O
compact	O
.	O
</s>
<s>
Although	O
the	O
Fuji	B-Algorithm
GX680	I-Algorithm
was	O
designed	O
for	O
studio	O
work	O
due	O
to	O
its	O
size	O
and	O
weight	O
,	O
a	O
neck-strap	O
was	O
offered	O
for	O
mobile	O
work	O
.	O
</s>
<s>
The	O
Fuji	B-Algorithm
GX680	I-Algorithm
has	O
been	O
built	O
in	O
3	O
model	O
variants	O
(	O
numbers	O
in	O
parentheses	O
are	O
the	O
production	O
periods	O
)	O
:	O
</s>
<s>
The	O
3	O
models	O
differ	O
externally	O
only	O
by	O
slight	O
modifications	O
on	O
displays	O
,	O
controls	O
and	O
rechargeable	B-Architecture
battery	I-Architecture
versus	O
battery	O
.	O
</s>
<s>
The	O
GX680	B-Algorithm
was	O
introduced	O
in	O
1987	O
,	O
and	O
shown	O
at	O
the	O
Photographic	O
Marketing	O
Association	O
convention	O
with	O
nine	O
lenses	O
,	O
which	O
was	O
held	O
in	O
Chicago	O
.	O
</s>
<s>
The	O
original	O
GX680	B-Algorithm
and	O
GX680II	O
are	O
powered	O
by	O
a	O
rechargeable	B-Architecture
nickel-cadmium	O
battery	O
,	O
which	O
provides	O
sufficient	O
power	O
for	O
approximately	O
1000	O
exposures	O
and	O
recharges	B-Architecture
in	O
1	O
hour	O
.	O
</s>
<s>
The	O
Fuji	B-Algorithm
GX680	I-Algorithm
system	O
features	O
interchangeable	O
camera	O
lenses	O
,	O
viewfinders	O
and	O
focusing	O
screens	O
,	O
film	O
holders	O
(	O
also	O
for	O
instant	O
film	O
)	O
,	O
batteries	O
,	O
and	O
bellows	B-Algorithm
including	O
the	O
standard	O
bellows	B-Algorithm
,	O
bag	O
bellows	B-Algorithm
for	O
wide	O
angle	O
lenses	O
and	O
extended	O
long	O
bellows	B-Algorithm
for	O
telephoto	O
lenses	O
over	O
150mm	O
.	O
</s>
<s>
Optional	O
accessories	O
include	O
50mm	O
extension	O
rail	O
sets	O
for	O
close	O
ups	O
,	O
a	O
remote	O
release	O
,	O
viewfinder	O
correction	O
lenses	O
,	O
neck	O
strap	O
,	O
and	O
bellows	B-Algorithm
lens	O
shades	O
.	O
</s>
<s>
Fuji	O
produced	O
a	O
digital	O
back	O
for	O
the	O
GX680	B-Algorithm
but	O
it	O
was	O
only	O
available	O
in	O
Japan	O
.	O
</s>
<s>
The	O
film	O
holders	O
for	O
the	O
GX680	B-Algorithm
and	O
GX680II	O
feature	O
a	O
backup	O
ER-3	O
lithium	O
battery	O
to	O
retain	O
data	O
.	O
</s>
<s>
+Comparison	O
of	O
key	O
specifications	O
GX680	B-Algorithm
GX680	B-Algorithm
II	O
GX680	B-Algorithm
III	O
&	O
IIIS	O
Power	O
Source	O
rechargeable	B-Architecture
battery	I-Architecture
(	O
7.2V	O
)	O
3×	O
CR123A	O
batteries	O
(	O
9V	O
)	O
,	O
optional	O
battery	O
holder	O
Display	B-Device
LEDs	O
LCD	O
Error	O
warnings	O
Yes	O
,	O
audible	O
and	O
visual	O
Lenses	O
EBC	O
Fujinon	O
GX	O
or	O
EBC	O
Fujinon	O
GX	O
M	O
Display	B-Device
Filmcounter	O
Counter	O
for	O
camera	O
&	O
filmholder	O
Counter	O
for	O
camera	O
,	O
filmholder	O
&	O
lens	O
Film	O
advance	O
Yes	O
,	O
automatic	O
to	O
first	O
frame	O
&	O
after	O
last	O
frame	O
;	O
motor-driven	O
between	O
each	O
exposure	O
via	O
discrete	O
film	O
wind	O
button	O
Data	O
recording	O
No	O
Yes	O
,	O
with	O
film	O
holder	O
III	O
Film	O
120/220	O
type	O
6	O
cm	O
roll	O
film	O
Formats	O
Portrait/Landscape	O
by	O
revolving	O
the	O
film	O
holder	O
,	O
viewfinder	O
mask	O
coupled	O
to	O
the	O
revolving	O
film	O
holder	O
shows	O
the	O
actual	O
orientation	O
6×8	O
cm	O
(	O
56×76mm	O
)	O
Lens-Shift	O
,	O
max	O
.	O
</s>
<s>
Auto	O
Exposure	O
AE	O
(	O
Aperture	B-Algorithm
priority	I-Algorithm
,	O
set	O
Aperture	O
manually	O
,	O
automatic	O
setting	O
of	O
Shutter	O
Speed	O
depending	O
on	O
ISO-setting	O
on	O
film-holder	O
in	O
combination	O
with	O
Exposuremeter	O
in	O
AE-Finder	O
)	O
OTF-Exposure-Warning	O
,	O
-Display	O
Yes	O
,	O
displayed	O
via	O
LEDs	O
Yes	O
,	O
displayed	O
via	O
LCD	O
OTF-Sensitivity	O
LW	O
4	O
–	O
18	O
at	O
ISO	O
100	O
LW	O
5	O
–	O
19	O
at	O
ISO	O
100	O
TTL-Light	O
-	O
&	O
-Flashlight-Measure	O
No	O
,	O
only	O
via	O
AE-Finder	O
Weight	O
4146g	O
4256g	O
III	O
:	O
4070g	O
,	O
2690g	O
IIIS	O
:	O
3720g	O
,	O
2350g	O
Dimensions	O
III	O
:	O
IIIS	O
:	O
</s>
<s>
A	O
Lens	O
Board	O
Adapter	O
accessory	O
permits	O
the	O
use	O
of	O
large-format	O
camera	O
lenses	O
fitting	O
Linhof	O
Technika	O
type	O
lens	O
boards	O
,	O
but	O
the	O
shutter	O
of	O
these	O
lenses	O
is	O
not	O
controlled	O
by	O
the	O
Fuji	B-Algorithm
GX680	I-Algorithm
,	O
so	O
they	O
must	O
be	O
pre-focussed	O
and	O
then	O
manually	O
triggered	O
after	O
the	O
mirror	O
is	O
locked	O
up	O
.	O
</s>
<s>
As	O
the	O
Fuji	B-Algorithm
GX680	I-Algorithm
series	O
are	O
system	B-Algorithm
cameras	I-Algorithm
there	O
is	O
a	O
wide	O
range	O
of	O
accessories	O
:	O
</s>
<s>
AE	O
viewfinders	O
-	O
each	O
equipped	O
with	O
centre-weighted	O
Exposure	O
Meter	O
(	O
including	O
flash	O
)	O
,	O
enabling	O
aperture	B-Algorithm
priority	I-Algorithm
autoexposure	O
:	O
</s>
