<s>
Nikonos	B-Algorithm
is	O
the	O
brand	O
name	O
of	O
a	O
series	O
of	O
35mm	O
format	O
cameras	O
specifically	O
designed	O
for	O
underwater	O
photography	O
launched	O
by	O
Nikon	B-Algorithm
in	O
1963	O
.	O
</s>
<s>
The	O
early	O
Nikonos	B-Algorithm
cameras	O
were	O
improvements	O
of	O
the	O
Calypso	B-Algorithm
camera	I-Algorithm
,	O
which	O
was	O
an	O
original	O
design	O
by	O
Jacques-Yves	O
Cousteau	O
and	O
Belgian	O
engineer	O
Jean	O
de	O
Wouters	O
.	O
</s>
<s>
It	O
was	O
produced	O
in	O
France	O
by	O
La	O
Spirotechnique	O
(	O
currently	O
Aqua	O
Lung	O
)	O
until	O
the	O
design	O
was	O
acquired	O
by	O
Nikon	B-Algorithm
to	O
become	O
the	O
Nikonos	B-Algorithm
.	O
</s>
<s>
The	O
Nikonos	B-Algorithm
system	O
was	O
immensely	O
popular	O
with	O
both	O
amateur	O
and	O
professional	O
underwater	O
photographers	O
.	O
</s>
<s>
Nikon	B-Algorithm
ceased	O
development	O
and	O
manufacture	O
of	O
new	O
Nikonos	B-Algorithm
cameras	O
in	O
2001	O
,	O
but	O
the	O
camera	O
remains	O
popular	O
,	O
and	O
there	O
is	O
a	O
large	O
and	O
active	O
secondary	O
market	O
.	O
</s>
<s>
Nippon	O
Kogaku	O
trace	O
their	O
underwater	O
camera	O
history	O
back	O
to	O
1956	O
,	O
when	O
the	O
company	O
developed	O
an	O
underwater	O
housing	O
for	O
the	O
Nikon	B-Algorithm
S2	O
rangefinder	B-Algorithm
camera	I-Algorithm
,	O
which	O
was	O
marketed	O
in	O
May	O
as	O
the	O
Nikon	B-Algorithm
Marine	O
.	O
</s>
<s>
At	O
approximately	O
the	O
same	O
time	O
,	O
Jean	O
de	O
Wouters	O
was	O
building	O
the	O
first	O
prototypes	O
of	O
the	O
Calypso	B-Algorithm
for	O
La	O
Spirotechnique	O
,	O
which	O
went	O
into	O
serial	O
production	O
in	O
1961	O
.	O
</s>
<s>
However	O
,	O
La	O
Spirotechnique	O
was	O
not	O
experienced	O
with	O
camera	O
design	O
and	O
manufacture	O
,	O
so	O
they	O
approached	O
Nippon	O
Kogaku	O
to	O
license	O
the	O
production	O
and	O
sales	O
rights	O
in	O
June	O
1961	O
;	O
the	O
two	O
companies	O
signed	O
a	O
contract	O
in	O
February	O
1962	O
granting	O
the	O
worldwide	O
sales	O
and	O
distribution	O
rights	O
to	O
Nikon	B-Algorithm
outside	O
France	O
and	O
the	O
European	O
Economic	O
Community	O
.	O
</s>
<s>
Nippon	O
Kogaku	O
acquired	O
the	O
patent	O
to	O
the	O
Calypso	B-Algorithm
in	O
1963	O
and	O
began	O
manufacturing	O
the	O
Nikonos	B-Algorithm
(	O
later	O
designated	O
the	O
Nikonos	B-Algorithm
I	O
)	O
equipped	O
with	O
Nikkor	O
optics	O
instead	O
of	O
the	O
original	O
SOM	O
Berthiot	O
and	O
Angenieux	O
lenses	O
.	O
</s>
<s>
Because	O
of	O
its	O
waterproof	O
housing	O
,	O
lens	O
options	O
,	O
and	O
toughness	O
,	O
the	O
Nikonos	B-Algorithm
was	O
an	O
important	O
tool	O
for	O
photographers	O
working	O
in	O
the	O
steaming	O
jungles	O
,	O
flooded	O
rice	O
paddies	O
,	O
and	O
rain-lashed	O
battlefields	O
of	O
the	O
Vietnam	O
War	O
.	O
</s>
<s>
The	O
wire	O
services	O
loaded	O
their	O
Nikonos	B-Algorithm
cameras	O
with	O
Tri-X	O
,	O
Ektachrome-X	O
or	O
High-Speed	O
Ektachrome	O
.	O
</s>
<s>
Nikon	B-Algorithm
continued	O
to	O
manufacture	O
Nikonos	B-Algorithm
V	O
bodies	O
until	O
2001	O
,	O
when	O
it	O
formally	O
announced	O
it	O
was	O
terminating	O
the	O
series	O
.	O
</s>
<s>
Without	O
any	O
new	O
models	O
in	O
years	O
and	O
with	O
digital	B-Algorithm
imaging	I-Algorithm
taking	O
over	O
the	O
market	O
,	O
Nikon	B-Algorithm
saw	O
no	O
reason	O
to	O
continue	O
the	O
series	O
.	O
</s>
<s>
The	O
numbered	O
Nikonos	B-Algorithm
cameras	O
are	O
often	O
called	O
rangefinder	B-Algorithm
cameras	I-Algorithm
,	O
but	O
in	O
truth	O
they	O
are	O
scale	O
focus	O
cameras	O
as	O
there	O
is	O
no	O
rangefinder	B-Algorithm
.	O
</s>
<s>
The	O
viewfinder	O
is	O
used	O
purely	O
to	O
compose	O
the	O
shot	O
,	O
and	O
to	O
display	O
exposure	O
information	O
on	O
bodies	O
with	O
internal	O
metering	O
(	O
Nikonos	B-Algorithm
IV-A	O
and	O
V	O
)	O
.	O
</s>
<s>
Nikon	B-Algorithm
assumed	O
the	O
user	O
did	O
not	O
compensate	O
for	O
appearances	O
underwater	O
,	O
so	O
the	O
distance	O
markers	O
on	O
the	O
lens	O
are	O
marked	O
for	O
apparent	O
(	O
not	O
actual	O
)	O
distance	O
.	O
</s>
<s>
Thankfully	O
the	O
Nikonos	B-Algorithm
wide-angle	O
lenses	O
have	O
ample	O
depth	O
of	O
field	O
,	O
so	O
these	O
discrepancies	O
are	O
often	O
not	O
a	O
noticeable	O
problem	O
.	O
</s>
<s>
The	O
depth	O
of	O
field	O
indicators	O
on	O
most	O
Nikonos	B-Algorithm
Nikkor	O
lenses	O
mechanically	O
adjust	O
with	O
aperture	O
.	O
</s>
<s>
The	O
numbered	O
Nikonos	B-Algorithm
models	O
all	O
had	O
rugged	O
construction	O
,	O
simple	O
controls	O
,	O
and	O
were	O
waterproof	O
to	O
.	O
</s>
<s>
+Nikonos	O
camera	O
specifications	O
Model	O
Intro	O
Disc	O
Image	O
Size	O
(	O
W×H×D	O
)	O
Weight	O
Metering	O
Shutter	O
speeds	O
Serial	O
numbers	O
Price	O
Ref	O
.	O
</s>
<s>
The	O
initial	O
Nikonos	B-Algorithm
line	O
consisted	O
of	O
three	O
models	O
that	O
were	O
improved	O
versions	O
of	O
Cousteau	O
's	O
Calypso	B-Algorithm
of	O
1961	O
:	O
</s>
<s>
The	O
Nikonos	B-Algorithm
was	O
introduced	O
at	O
Photokina	O
1963	O
;	O
in	O
the	O
beginning	O
,	O
each	O
camera	O
was	O
individually	O
tested	O
for	O
water-tightness	O
.	O
</s>
<s>
In	O
Europe	O
,	O
under	O
the	O
terms	O
of	O
the	O
licensing	O
agreement	O
,	O
the	O
Nikonos	B-Algorithm
was	O
known	O
as	O
the	O
Calypso/Nikkor	O
.	O
</s>
<s>
In	O
July	O
1966	O
,	O
Nikon	B-Algorithm
began	O
marketing	O
the	O
Nikonos	B-Algorithm
as	O
an	O
all-weather	O
camera	O
and	O
sold	O
a	O
limited	O
number	O
of	O
cameras	O
with	O
a	O
white	O
finish	O
,	O
which	O
consisted	O
of	O
Nikonos	B-Algorithm
cameras	O
with	O
white	O
leather	O
body	O
panels	O
.	O
</s>
<s>
It	O
is	O
estimated	O
that	O
less	O
than	O
150	O
examples	O
of	O
the	O
white-finished	O
Nikonos	B-Algorithm
were	O
made	O
.	O
</s>
<s>
In	O
total	O
,	O
approximately	O
200,000	O
Nikonos	B-Algorithm
I	O
,	O
II	O
,	O
and	O
III	O
cameras	O
were	O
manufactured	O
between	O
1963	O
and	O
1983	O
.	O
</s>
<s>
The	O
three	O
Calypso-based	O
Nikonos	B-Algorithm
models	O
share	O
the	O
same	O
basic	O
structure	O
where	O
the	O
complete	O
camera	O
consists	O
of	O
three	O
modules	O
:	O
lens	O
,	O
housing	O
,	O
and	O
shutter/film	O
transport	O
assemblies	O
.	O
</s>
<s>
The	O
Nikonos	B-Algorithm
II	O
was	O
cosmetically	O
and	O
dimensionally	O
similar	O
to	O
the	O
original	O
Nikonos	B-Algorithm
,	O
but	O
the	O
shutter	O
speed	O
dial	O
has	O
an	O
additional	O
rewind	O
setting	O
,	O
and	O
the	O
rewind	O
knob	O
is	O
equipped	O
with	O
a	O
lever	O
to	O
facilitate	O
operation	O
.	O
</s>
<s>
Internally	O
,	O
all	O
parts	O
of	O
the	O
Nikonos	B-Algorithm
II	O
were	O
coated	O
to	O
avoid	O
corrosion	O
;	O
in	O
case	O
of	O
leakage	O
,	O
the	O
internal	O
parts	O
could	O
be	O
rinsed	O
in	O
fresh	O
water	O
and	O
dried	O
,	O
leading	O
some	O
to	O
call	O
the	O
Nikonos	B-Algorithm
II	O
indestructible	O
.	O
</s>
<s>
The	O
film	O
transport	O
mechanism	O
was	O
redesigned	O
for	O
the	O
Nikonos	B-Algorithm
III	O
to	O
use	O
the	O
sprocket	O
holes	O
for	O
positive	O
framing	O
;	O
the	O
original	O
Calypso	B-Algorithm
design	O
did	O
not	O
count	O
sprocket	O
holes	O
which	O
sometimes	O
resulted	O
in	O
overlapping	O
frames	O
.	O
</s>
<s>
A	O
second	O
viewfinder	O
line	O
was	O
Nikon	B-Algorithm
's	O
complete	O
re-design	O
and	O
included	O
a	O
through-the-lens	O
(	O
TTL	O
)	O
light	O
meter	O
with	O
automatic	O
exposure	O
:	O
</s>
<s>
In	O
contrast	O
to	O
the	O
prior	O
Nikonos	B-Algorithm
line	O
,	O
the	O
Nikonos	B-Algorithm
IV-A	O
introduced	O
a	O
one-piece	O
body	O
using	O
a	O
hinged	O
back	O
for	O
film	O
loading	O
;	O
sealing	O
was	O
accomplished	O
through	O
numerous	O
o-rings	O
,	O
including	O
a	O
large	O
gasket	O
for	O
the	O
back	O
.	O
</s>
<s>
The	O
film	O
transport	O
mechanism	O
for	O
the	O
IV-A	O
was	O
adapted	O
from	O
the	O
contemporary	O
Nikon	B-Algorithm
EM	I-Algorithm
.	O
</s>
<s>
Like	O
the	O
EM	O
,	O
the	O
Nikonos	B-Algorithm
IV-A	O
primarily	O
operated	O
in	O
aperture-priority	O
autoexposure	O
mode	O
using	O
stepless	O
quartz-controlled	O
shutter	O
speeds	O
between	O
and	O
,	O
but	O
the	O
camera	O
also	O
offered	O
two	O
mechanical	O
shutter	O
speeds	O
( [	O
B ]ulb	O
and	O
,	O
marked	O
as	O
M90	O
)	O
in	O
case	O
of	O
battery	O
failure	O
.	O
</s>
<s>
The	O
Nikonos	B-Algorithm
V	O
retained	O
the	O
new	O
features	O
of	O
the	O
IV-A	O
and	O
added	O
manual	O
control	O
to	O
set	O
discrete	O
shutter	O
speeds	O
.	O
</s>
<s>
The	O
Nikonos	B-Algorithm
V	O
was	O
capable	O
of	O
off-the-film-plane	O
flash	O
metering	O
with	O
the	O
SB-102	O
speedlight	O
,	O
which	O
was	O
introduced	O
alongside	O
the	O
camera	O
at	O
the	O
Photo	O
Marketing	O
Association	O
Show	O
in	O
Las	O
Vegas	O
,	O
held	O
April	O
1984	O
.	O
</s>
<s>
The	O
1992	O
Nikonos	B-Algorithm
RS	O
introduced	O
an	O
entirely	O
new	O
concept	O
.	O
</s>
<s>
Unlike	O
its	O
predecessors	O
,	O
the	O
RS	O
was	O
a	O
complete	O
amphibious	O
single	B-Algorithm
lens	I-Algorithm
reflex	I-Algorithm
camera	I-Algorithm
,	O
with	O
auto-focus	O
,	O
waterproof	O
to	O
and	O
its	O
own	O
set	O
of	O
unique	O
lenses	O
that	O
also	O
utilized	O
water-contact	O
optics	O
.	O
</s>
<s>
Previous	O
Nikonos	B-Algorithm
models	O
used	O
lens-mounted	O
knobs	O
for	O
aperture	O
and	O
focus	O
;	O
these	O
controls	O
were	O
moved	O
to	O
the	O
top	O
deck	O
and	O
front	O
grip	O
of	O
the	O
Nikonos	B-Algorithm
RS	O
,	O
respectively	O
.	O
</s>
<s>
The	O
RS	O
represented	O
the	O
pinnacle	O
of	O
Nikon	B-Algorithm
's	O
commitment	O
to	O
underwater	O
imaging	O
,	O
and	O
generated	O
significant	O
interest	O
at	O
the	O
time	O
.	O
</s>
<s>
Flooding	O
was	O
attributed	O
to	O
many	O
factors	O
,	O
one	O
of	O
which	O
was	O
the	O
change	O
to	O
orange-colored	O
silicone	O
o-rings	O
that	O
could	O
swell	O
and	O
fail	O
if	O
third-party	O
silicone	O
grease	O
was	O
applied	O
instead	O
of	O
the	O
Nikonos	B-Algorithm
grease	O
that	O
was	O
petroleum-based	O
.	O
</s>
<s>
Non-Nikon	O
(	O
third	O
party	O
)	O
silicone	O
grease	O
was	O
commonly	O
used	O
without	O
problems	O
on	O
black	O
Nikonos	B-Algorithm
o-rings	O
by	O
underwater	O
photographers	O
for	O
several	O
decades	O
.	O
</s>
<s>
Nikon	B-Algorithm
replaced	O
all	O
these	O
floods	O
at	O
first	O
,	O
but	O
in	O
the	O
end	O
,	O
it	O
clearly	O
became	O
not	O
worth	O
the	O
trouble	O
.	O
</s>
<s>
No	O
Digital	O
Nikonos	B-Algorithm
has	O
ever	O
been	O
made	O
,	O
but	O
the	O
Commercial	O
&	O
Government	O
Systems	O
division	O
of	O
Kodak	O
modified	O
a	O
small	O
number	O
of	O
Nikonos	B-Algorithm
RS	O
cameras	O
for	O
the	O
United	O
States	O
Navy	O
to	O
create	O
a	O
digital	O
unit	O
known	O
as	O
the	O
"	O
Nikon/Kodak	O
DCS	O
425	O
"	O
.	O
</s>
<s>
The	O
digital	B-Algorithm
imaging	I-Algorithm
portion	O
was	O
housed	O
in	O
an	O
extended	O
rear	O
door	O
and	O
were	O
largely	O
identical	O
to	O
the	O
options	O
available	O
for	O
the	O
contemporary	O
Kodak	B-Device
DCS	I-Device
420	I-Device
cameras	I-Device
based	O
on	O
the	O
Nikon	B-Algorithm
F90	I-Algorithm
.	O
</s>
<s>
Nikon	B-Algorithm
celebrated	O
the	O
Nikonos	B-Algorithm
legacy	O
when	O
the	O
Nikon	B-Algorithm
1	I-Algorithm
AW1	I-Algorithm
was	O
released	O
,	O
a	O
waterproof	O
interchangeable-lens	O
digital	O
camera	O
.	O
</s>
<s>
Reviewers	O
compared	O
the	O
features	O
of	O
the	O
AW1	O
to	O
the	O
Nikonos	B-Algorithm
line	O
.	O
</s>
<s>
The	O
Nikonos	B-Algorithm
I	O
to	O
III	O
bodies	O
were	O
sealed	O
by	O
a	O
barrel	O
seal	O
O-ring	O
around	O
the	O
lower	O
edge	O
,	O
which	O
was	O
simple	O
and	O
fairly	O
reliable	O
.	O
</s>
<s>
With	O
the	O
exception	O
of	O
the	O
above-water	O
only	O
LW-Nikkor	O
28mm	O
,	O
all	O
Nikonos	B-Algorithm
Nikkor	O
lenses	O
use	O
two	O
knobs	O
to	O
facilitate	O
focus	O
and	O
aperture	O
operation	O
with	O
gloved	O
hands	O
.	O
</s>
<s>
The	O
two	O
most	O
common	O
Nikonos	B-Algorithm
lenses	O
are	O
the	O
UW	O
28mm	O
(	O
for	O
underwater	O
use	O
only	O
)	O
and	O
the	O
W	O
35mm	O
(	O
which	O
is	O
amphibious	O
)	O
with	O
the	O
UW	O
28mm	O
being	O
considered	O
the	O
better	O
lens	O
.	O
</s>
<s>
These	O
were	O
also	O
the	O
first	O
two	O
lenses	O
to	O
be	O
introduced	O
with	O
the	O
Nikonos	B-Algorithm
;	O
the	O
design	O
of	O
the	O
W-Nikkor	O
35mm	O
is	O
based	O
on	O
the	O
Nikkor	O
35mm	O
2.5	O
lens	O
for	O
M39	O
mount	O
first	O
sold	O
in	O
1952	O
;	O
it	O
is	O
a	O
symmetric	O
Double-Gauss	O
lens	O
behind	O
an	O
optical	O
flat	O
to	O
make	O
the	O
assembly	O
water-tight	O
.	O
</s>
<s>
This	O
improves	O
lens	O
speed	O
compared	O
with	O
the	O
original	O
lens	O
fitted	O
to	O
the	O
Calypso	B-Algorithm
,	O
the	O
SOM	O
Berthiot	O
35mm	O
3.5	O
,	O
which	O
had	O
a	O
Tessar-type	O
construction	O
.	O
</s>
<s>
The	O
Nikonos	B-Algorithm
lenses	O
designated	O
"	O
UW-Nikkor	O
"	O
were	O
specifically	O
designed	O
for	O
underwater	O
photography	O
only	O
.	O
</s>
<s>
It	O
is	O
said	O
that	O
,	O
even	O
to	O
this	O
day	O
,	O
no	O
underwater	O
lens	O
matches	O
the	O
Nikonos	B-Algorithm
"	O
UW	O
"	O
lenses	O
for	O
sharpness	O
and	O
color	O
saturation	O
underwater	O
.	O
</s>
<s>
A	O
brief	O
explanation	O
from	O
Nikon	B-Algorithm
about	O
the	O
difference	O
between	O
underwater-only	O
lens	O
and	O
standard/	O
"	O
amphibious	O
"	O
lens	O
can	O
be	O
found	O
at	O
Nikon	B-Algorithm
official	O
site	O
,	O
under	O
the	O
section	O
"	O
2	O
.	O
</s>
<s>
Nikon	B-Algorithm
also	O
created	O
two	O
lenses	O
for	O
use	O
both	O
above	O
and	O
under	O
water	O
,	O
and	O
one	O
of	O
them	O
,	O
the	O
35mm	O
2.5	O
,	O
can	O
be	O
thought	O
of	O
as	O
the	O
"	O
kit	O
"	O
lens	O
.	O
</s>
<s>
They	O
made	O
the	O
Nikonos	B-Algorithm
useful	O
for	O
aquatic	O
activities	O
such	O
as	O
kayaking	O
,	O
canoeing	O
,	O
or	O
for	O
foul	O
weather	O
situations	O
.	O
</s>
<s>
+Nikonos	O
lenses	O
Name	O
Focal	O
length	O
Intro	O
Aperture	O
Water	O
Min	O
focus	O
Angle	O
of	O
view	O
Construction	O
Size	O
Attachment	O
size	O
Ref	O
.	O
</s>
<s>
The	O
Nikonos	B-Algorithm
RS	O
mount	O
is	O
physically	O
identical	O
to	O
the	O
older	O
Nikon	B-Algorithm
F	O
mount	O
,	O
but	O
an	O
additional	O
external	O
bayonet	O
was	O
added	O
for	O
sealing	O
,	O
and	O
the	O
claws	O
are	O
slightly	O
offset	O
compared	O
to	O
the	O
venerable	O
still	O
camera	O
mount	O
.	O
</s>
<s>
The	O
electronic	O
signaling	O
is	O
also	O
different	O
from	O
regular	O
AF	O
Nikon	B-Algorithm
bodies	O
.	O
</s>
<s>
+Nikonos	O
RS	O
lenses	O
Name	O
Focal	O
length	O
Intro	O
Aperture	O
Water	O
Min	O
focus	O
Angle	O
of	O
view	O
Construction	O
Size	O
Attachment	O
size	O
Ref	O
.	O
</s>
<s>
Lenses	O
were	O
made	O
for	O
the	O
original	O
Nikonos	B-Algorithm
mount	O
(	O
for	O
example	O
,	O
by	O
Sea&Sea	O
)	O
,	O
which	O
included	O
both	O
prime	O
lenses	O
as	O
well	O
as	O
focal	O
length	O
converters	O
which	O
attached	O
to	O
the	O
front	O
of	O
a	O
Nikonos	B-Algorithm
lens	O
.	O
</s>
<s>
+Nikonos	O
mount	O
lenses	O
by	O
third	O
parties	O
Name	O
Focal	O
length	O
Intro	O
Aperture	O
Water	O
Min	O
focus	O
Angle	O
of	O
view	O
Construction	O
Size	O
Attachment	O
size	O
Ref	O
.	O
</s>
<s>
Extension	O
tubes	O
mounted	O
with	O
a	O
Nikonos	B-Algorithm
lens	O
for	O
macro	O
photography	O
,	O
most	O
commonly	O
with	O
the	O
35mm	O
Nikonos	B-Algorithm
lens	O
to	O
produce	O
2:1	O
,	O
1:1	O
and	O
1:2	O
macro	O
image	O
ratios	O
,	O
with	O
1:3	O
occasionally	O
seen	O
as	O
well	O
.	O
</s>
<s>
Offered	O
by	O
third	O
parties	O
;	O
no	O
Nikon	B-Algorithm
extension	O
tubes	O
were	O
produced	O
.	O
</s>
<s>
Nikon	B-Algorithm
Close	O
Up	O
Kit	O
,	O
which	O
included	O
a	O
close-up	O
lens	O
that	O
attached	O
to	O
the	O
front	O
of	O
either	O
the	O
UW	O
28mm	O
,	O
W	O
35mm	O
,	O
or	O
W	O
80mm	O
Nikonos	B-Algorithm
lenses	O
,	O
a	O
frame	O
support	O
bracket	O
,	O
and	O
three	O
field	O
frames	O
(	O
one	O
for	O
each	O
lens	O
)	O
to	O
produce	O
near-macro	O
image	O
ratios	O
(	O
approx	O
range	O
of	O
1:5	O
to	O
1:3	O
,	O
depending	O
on	O
the	O
lens	O
in	O
use	O
)	O
.	O
</s>
<s>
Because	O
the	O
numbered	O
Nikonos	B-Algorithm
cameras	O
did	O
not	O
offer	O
through-the-lens	O
viewing	O
,	O
the	O
extremely	O
shallow	O
depth	O
of	O
field	O
for	O
macro	O
photography	O
pragmatically	O
required	O
a	O
focusing	O
aid	O
.	O
</s>
<s>
The	O
Nikon	B-Algorithm
Close	O
Up	O
Kit	O
provided	O
a	O
complete	O
rectangular	O
frame	O
,	O
but	O
most	O
third-party	O
extension	O
tube	O
kits	O
typically	O
only	O
indexed	O
the	O
bottom	O
and	O
two	O
sides	O
,	O
not	O
the	O
top	O
,	O
and	O
because	O
of	O
this	O
shape	O
,	O
a	O
slang	O
term	O
for	O
Nikonos	B-Algorithm
framers	O
were	O
Goal	O
Posts	O
.	O
</s>
<s>
The	O
Nikonos	B-Algorithm
light	O
meter	O
accessory	O
houses	O
the	O
selenium-celled	O
Sekonic	O
L-86	O
Auto-Lumi	O
.	O
</s>
<s>
An	O
underwater	O
light	O
meter	O
is	O
necessary	O
for	O
the	O
Nikonos	B-Algorithm
I	O
,	O
II	O
,	O
and	O
III	O
,	O
which	O
do	O
not	O
have	O
metering	O
in	O
the	O
body	O
.	O
</s>
<s>
The	O
first	O
Calypso-based	O
Nikonos	B-Algorithm
cameras	O
(	O
I	O
and	O
II	O
)	O
were	O
equipped	O
with	O
two-pin	O
sync	O
ports	O
for	O
flashbulb	O
units	O
.	O
</s>
<s>
The	O
Nikonos	B-Algorithm
III	O
added	O
a	O
third	O
pin	O
to	O
support	O
electronic	O
flash	O
units	O
;	O
although	O
a	O
prototype	O
was	O
exhibited	O
(	O
SB-11	O
)	O
,	O
the	O
first	O
electronic	O
Nikonos	B-Algorithm
flash	O
unit	O
,	O
the	O
SB-101	O
,	O
was	O
introduced	O
with	O
the	O
Nikonos	B-Algorithm
IV-A	O
;	O
both	O
the	O
IV-A	O
and	O
III	O
supported	O
the	O
SB-101	O
,	O
but	O
the	O
IV-A	O
dropped	O
support	O
for	O
the	O
flashbulb	O
units	O
.	O
</s>
<s>
The	O
SB-102	O
and	O
-103	O
were	O
introduced	O
with	O
the	O
Nikonos	B-Algorithm
V	O
,	O
with	O
the	O
SB-103	O
a	O
more	O
compact	O
version	O
of	O
the	O
SB-102	O
,	O
which	O
in	O
turn	O
was	O
an	O
updated	O
version	O
of	O
the	O
SB-101	O
.	O
</s>
<s>
The	O
SB-104	O
and	O
-105	O
were	O
introduced	O
with	O
the	O
Nikonos	B-Algorithm
RS	O
;	O
all	O
four	O
of	O
these	O
units	O
(	O
SB-102	O
through	O
-105	O
)	O
supported	O
TTL	O
flash	O
operation	O
.	O
</s>
<s>
Because	O
the	O
SB-103	O
housing	O
was	O
designed	O
to	O
be	O
pressure-resistant	O
,	O
Nikon	B-Algorithm
was	O
unable	O
to	O
crush	O
the	O
recalled	O
units	O
and	O
instead	O
drilled	O
a	O
hole	O
through	O
the	O
"	O
103	O
"	O
marking	O
on	O
the	O
side	O
of	O
the	O
flash	O
.	O
</s>
<s>
+Nikonos	O
underwater	O
flash	O
specifications	O
Name	O
Guide	O
No	O
.	O
</s>
<s>
An	O
unbranded	O
Nikonos	B-Algorithm
was	O
operated	O
by	O
James	O
Bond	O
in	O
the	O
1965	O
film	O
Thunderball	O
.	O
</s>
