<s>
Optical	B-Algorithm
format	I-Algorithm
is	O
a	O
hypothetical	O
measurement	O
approximately	O
50%	O
larger	O
than	O
the	O
true	O
diagonal	O
size	O
of	O
a	O
solid-state	O
photo	O
sensor	O
.	O
</s>
<s>
The	O
use	O
of	O
the	O
optical	B-Algorithm
format	I-Algorithm
means	O
that	O
a	O
lens	O
used	O
with	O
a	O
particular	O
size	O
sensor	O
will	O
have	O
approximately	O
the	O
same	O
angle	O
of	O
view	O
as	O
if	O
it	O
were	O
to	O
be	O
used	O
with	O
an	O
equivalent-sized	O
video	O
camera	O
tube	O
(	O
an	O
"	O
old-fashioned	O
"	O
TV	O
camera	O
)	O
.	O
</s>
<s>
The	O
optical	B-Algorithm
format	I-Algorithm
is	O
approximately	O
the	O
diagonal	O
length	O
of	O
the	O
sensor	O
multiplied	O
by	O
3/2	O
.	O
</s>
<s>
For	O
instance	O
,	O
a	O
6.4x4.8mm	O
sensor	O
has	O
a	O
diagonal	O
of	O
8.0mm	O
and	O
therefore	O
an	O
optical	B-Algorithm
format	I-Algorithm
of	O
8.0*3	O
/2	O
=	O
12mm	O
,	O
which	O
is	O
expressed	O
as	O
inch	O
in	O
imperial	O
units	O
.	O
</s>
<s>
Many	O
image	O
device	O
sheets	O
do	O
not	O
list	O
the	O
actual	O
optical	B-Algorithm
format	I-Algorithm
,	O
but	O
do	O
list	O
the	O
size	O
of	O
their	O
pixels	O
in	O
terms	O
of	O
micrometers	O
;	O
a	O
helpful	O
equation	O
can	O
be	O
used	O
to	O
convert	O
the	O
pixel	O
size	O
and	O
array	O
size	O
directly	O
to	O
optical	B-Algorithm
format	I-Algorithm
.	O
</s>
