<s>
The	O
Nikon	B-Algorithm
50	O
mm	O
1.8D	O
AF	O
Nikkor	O
is	O
one	O
of	O
Nikon	B-Algorithm
's	O
50mm	O
lenses	O
.	O
</s>
<s>
On	O
a	O
Nikon	B-Algorithm
DX	O
format	O
DSLR	B-Device
,	O
a	O
50mm	O
lens	O
is	O
cropped	O
to	O
the	O
angle	O
of	O
a	O
view	O
of	O
a	O
short	O
telephoto	O
lens	O
(	O
~	O
75mm	O
equivalent	O
;	O
field-of-view	O
crop	O
is	O
1.54	O
)	O
.	O
</s>
<s>
Being	O
an	O
F-mount	O
lens	O
,	O
it	O
will	O
mount	O
as	O
well	O
as	O
meter	O
on	O
all	O
Nikon	B-Algorithm
DSLRs	B-Device
.	O
</s>
<s>
The	O
lack	O
of	O
an	O
internal	O
autofocus	O
motor	O
means	O
that	O
this	O
lens	O
can	O
only	O
use	O
manual	O
focus	O
on	O
entry-level	O
cameras	O
such	O
as	O
the	O
D40	B-Algorithm
,	O
D60	B-Algorithm
,	O
D3000	B-Algorithm
,	O
D5000	B-Algorithm
,	O
D3100	B-Algorithm
or	O
D5100	B-Algorithm
;	O
however	O
,	O
a	O
newer	O
version	O
of	O
the	O
same	O
lens	O
,	O
the	O
Nikon	B-Algorithm
AF-S	O
Nikkor	O
50	O
mm	O
f/1.8G	O
,	O
will	O
autofocus	O
successfully	O
on	O
these	O
cameras	O
.	O
</s>
<s>
With	O
a	O
reverse	O
coupler	O
,	O
one	O
can	O
also	O
reverse	O
mount	O
this	O
lens	O
on	O
to	O
a	O
camera	O
or	O
reverse	O
mount	O
it	O
in	O
front	O
of	O
another	O
lens	O
to	O
use	O
it	O
for	O
macro	O
shots	O
,	O
although	O
it	O
is	O
a	O
procedure	O
not	O
recommended	O
by	O
Nikon	B-Algorithm
.	O
</s>
